Methods of amplification using a thermostable DNA polymerase from the hyperthermophilic archaeon strain KOD1 and reagent kit therefor

ABSTRACT

A nucleic acid amplifying enzyme having a short reaction time and high fidelity is provided. The enzyme of this invention is a thermostable DNA polymerase having a nucleic acid extension rate of at least 30 bases per second and a 3&#39;-5&#39; exonuclease activity. Also provided are a method and kit for amplifying nucleic acid.

FIELD OF THE INVENTION

The present invention relates to a method of amplifying nucleic acid wherein DNA or RNA is amplified within a short reaction time and with a high fidelity, to a method of identifying nucleic acid utilizing said amplifying method and to a DNA polymerase and a reagent kit used for those methods.

PRIOR ART

Many studies have been made already for DNA polymerase of mesophilic microorganism such as Escherichia coli and for DNA polymerase derived from phages infectable by the mesophilic microorganisms. In addition, many studies have been also made already for heat stable DNA polymerases which are useful in a recombinant DNA technique by means of nucleic acid amplification such as a polymerase chain reaction (PCR). Examples of the heat-stable polymerases which are used for the PCR are DNA polymerase (Tth polymerase) mostly derived from Thermus thermophilus and DNA polymerase (Taq polymerase) derived from Thermus aguaticus. Other known examples are DNA polymerase (Pfu polymerase) derived from Pyrococcus furiosus and DNA polymerase (Vent polymerase) derived from Thermococcus litoralis.

PROBLEMS TO BE SOLVED BY THE INVENTION

However, with the Taq polymerase, fidelity and thermostability upon the synthesis of DNA are not sufficient. Although the Pfu polymerase exhibiting excellent fidelity and thermostability has been developed, said Pfu polymerase has some problems that its DNA extension rate is slow and a processivity is low whereby it has been used only for a specific PCR.

Recently, a PCR whereby 20 kb or more DNA is amplified (hereinafter, referred to as a long-PCR) has been developed. In said long-PCR, both Tag polymerase and Pfu polymerase are mixed whereby properties of both enzymes are utilized. However, when two enzymes having different properties are used in the same reaction system, some discrepancies might occur in their appropriate reaction conditions whereby there is a question whether the high extension rate and fidelity which are the advantages of each of those enzymes can be still maintained. Moreover, because of the difference in the thermostabilities and in the composition of the stock solutions of both enzymes, there is a question as to the stability when they are stored in the same container.

In view of the above, there has been a keen demand for novel thermostable polymerase which exhibits both of those advantages.

SUMMARY OF INVENTION

The present inventors have succeeded in preparing a thermostable DNA polymerase from a hyperthermophilic archaeon strain KOD1, and, when its properties are investigated, it has been found that said DNA polymerase exhibits the advantages of the above-mentioned two enzymes, i.e. high extension rate and high fidelity, whereby the present invention has been achieved.

Thus, the present invention relates to a method for amplifying a target nucleic acid comprising reacting the target nucleic acid with four kinds of dNTP and primer complementary to said target nucleic acid in a buffer solution which contains a thermostable DNA polymerase having a DNA extension rate of at least 30 bases/second and a 3'-5' exonuclease activity such that the above mentioned primer is annealed to the target nucleic acid and an extension product is synthesized from the primer.

The present invention further relates to a method for amplifying a target nucleic acid in a sample wherein each target nucleic acid consists of two separate complementary strands which comprises the following steps A to D, characterized in that a thermostable DNA polymerase having a DNA extension rate of at least 30 bases/second and a 3'-5' exonuclease activity is used as a thermostable DNA polymerase;

A: modifying the target nucleic acid, if necessary, to produce single-stranded nucleic acids;

B: reacting the single-stranded nucleic acids with four kinds of dNTP and primers, wherein said primers are selected so as to be sufficiently complementary to different strands of target nucleic acid to anneal therewith, in a buffer solution which contains a thermostable DNA polymerase such that the above mentioned primers are annealed to the single-stranded nucleic acids and extension products are synthesized from the primers,

C: separating the primer extension products from the templates on which they are synthesized to produce single-stranded nucleic acids; and

D: repeatedly conducting the above mentioned steps B and C.

The present invention further relates to a method for detecting a target nucleic acid in a sample wherein each target nucleic acid consists of two separate complementary strands which comprises the following steps A to E, characterized in that a thermostable DNA polymerase having a DNA extension rate of at least 30 bases/second and a 3'-5' exonuclease activity is used as a thermostable DNA polymerase;

A: modifying the target nucleic acid, if necessary, to produce single-stranded nucleic acids;

B: reacting the single-stranded nucleic acids with four kinds of dNTP and primers, wherein said primers are selected so as to be sufficiently complementary to different strands of target nucleic acid to anneal therewith, in a buffer solution which contains a thermostable DNA polymerase such that the above mentioned primers are annealed to the single-stranded nucleic acids and extension products are synthesized from the primers,

C: separating the primer extension products from the templates on which they are synthesized to produce single-stranded nucleic acids;

D: repeatedly conducting the above mentioned steps B and C, and

E: detecting an amplified nucleic acid.

The present invention further relates to a reagent kit for amplifying target nucleic acid which comprises primers, wherein said primers are selected so as to be sufficiently complementary to different strands of target nucleic acid to anneal therewith, four kinds of dNTP, divalent cation, thermostable DNA polymerase having a DNA extension rate of at least 30 bases/second and a 3'-5' exonuclease activity and buffer solution.

The present invention further relates to a reagent kit for detecting target nucleic acid which comprises primers, wherein said primers are selected so as to be sufficiently complementary to different strands of target nucleic acid to anneal therewith, four kinds of dNTP, divalent cation, thermostable DNA polymerase having a DNA extension rate of at least 30 bases/second and a 3'-5' exonuclease activity, amplifying buffer solution, a probe capable of hybridizing with amplified nucleic acid and a detection buffer solution.

DESCRIPTION OF THE DRAWINGS

FIG. 1 is a stained alkaline agarose gel on which DNA extended by Hyperthermophilic Archaeon Strain KOD1 polymerase for various lengths of time was separated.

FIG. 2a is a stained alkaline agarose gel on which DNA extended for various times using the present polymerase and using Pfu polymerase was separated.

FIG. 2b is a stained alkaline agarose gel on which DNA extended by Deep Vent polymerase and DNA extended by Taq polymerase was separated.

FIG. 3 is a comparison of PCR products obtained using the present polymerase at different reaction times.

FIG. 4 is a schematic drawing of the construction of a recombinant vector encoding the present polymerase gene.

FIG. 5 is a stained SDS-PAGE gel showing the molecular weight of the present polymerase.

FIG. 6 is a stained SDS-PAGE gel showing the PCR products of a reaction driven by the present polymerase.

FIG. 7 is a schematic drawing of the intron and exon structure of the Hyperthermophilic Archaeon strain KOD1 polymerase gene.

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to a thermostable DNA polymerase which is obtainable from a strain KOD1 which belongs to a hyperthermophilic archaeon strain.

The present invention relates to an isolated DNA comprising a nucleotide sequence that encodes the thermostable DNA polymerase derived from a KOD1 strain which belongs to hyperthermophilic archaeon.

The present invention further relates to a recombinant DNA expression vector that comprises the DNA sequence inserted into a vector, wherein the DNA sequence encodes the thermostable DNA polymerase derived from a KOD1 strain which belongs to hyperthermophilic archaeon.

The present invention further relates to a transformed recombinant host cell using a recombinant DNA expression vector that comprises the DNA sequence inserted into a vector, wherein the DNA sequence encodes the thermostable DNA polymerase derived from a KOD1 strain which belongs to hyperthermophilic archaeon.

The present invention relates to a method for producing a DNA polymerase obtainable from a KOD1 strain which belongs to hyperthermophilic archaeon, comprising culturing recombinant host cells which are transformed by a recombinant DNA expression vector that comprises the DNA sequence inserted into a vector, wherein the DNA sequence encodes the thermostable DNA polymerase derived from a KOD1 strain which belongs to hyperthermophilic archaeon, and recovering the produced thermostable DNA polymerase.

The present invention further relates to a method for purifying the DNA polymerase obtainable from a KOD1 strain which belongs to hyperthermophilic archaeon, comprising culturing the recombinant host cells which are transformed by a recombinant DNA expression vector that comprises the DNA sequence inserted into a vector, wherein the DNA sequence encodes the thermostable DNA polymerase derived from a KOD1 strain which belongs to hyperthermophilic archaeon, and further (a) recovering the cultured recombinant host cells, lysing them and preparing the cell extract, and (b) removing the impurified proteins derived from recombinant host cells.

The nucleic acid which is to be amplified by the present invention is DNA or RNA. There is no restriction at all for the sample in which such a nucleic acid is contained.

The thermostable enzyme which is used in the present invention is a thermostable DNA polymerase having at least 30 bases/second of DNA extension rate and having a 3'-5' exonuclease activity. Its specific example is a DNA polymerase derived from a hyperthermophilic archaeon strain KOD1 (called a KOD polymerase) and said enzyme may be either a thermostable enzyme purified from nature or an enzyme manufactured by a gene recombination technique.

The DNA extension rate in the present invention is calculated from the relationship between the reaction time and the size of the synthesized DNA in the reaction of various kinds of DNA polymerases such as KOD, Pfu, Deep Vent, Tag, etc. (5U) in each buffer using a substrate prepared by annealing a single-stranded DNA (1.6 μg) of M13 with a primer (16 pmoles) complementary thereto. It is essential in the present invention that the DNA extension rate is at least 30 bases/second.

The DNA extension rates for each of the polymerases are 105-130 bases/second for KOD polymerase, 24.8 bases/second for Pfu polymerase, 23.3 bases/second for Deep Vent polymerase and 61.0 bases/second for Taq polymerase.

On the other hand, it is essential in the present invention that the thermostable DNA polymerase has a 3'-5' exonuclease activity.

In the present invention, the 3'-5' exonuclease activity is determined by checking the rate of release of ³ H under the optimum condition for each polymerase using a substrate wherein the 3'-end of the lambda-DNA digested with HindIII labeled with [³ H]TTP.

In the 3'-5' exonuclease activity of each polymerase, free-³ H is found to be only 10-20%. In the case of Taq polymerase and Tth polymerase after an incubation period of three hours, in KOD polymerase and Pfu polymerase, it is 50-70%.

It has been confirmed that the KOD polymerase used in the present invention has a 3'-5' exonuclease activity and that, in the gene which codes for KOD polymerase, there is a DNA conserved sequence showing a 3'-5' exonuclease activity, which is the same as in the case of Pfu polymerase.

In the present invention, the fact whether there is a 3'-5' exonuclease activity is checked in such a manner that KOD polymerase is allowed to stand, using a DNA fragment into which the DNA of [³ H]TTP-labelled-lambda-DNA digested with HindIII is incorporated as a substrate, at the reaction temperature of 75° C. in a buffer (20 mM Tris-HCl of pH 6.5, 10 mM KCl, 6 mM (NH₄)₂ SO₄, 2 mM MgCl₂, 0.1% Triton X-100 and 10 μg/ml BSA) and the ratio of the free-[³ H]TTP is determined.

At the same time, Taq polymerase and Tth polymerase having no 3'-5' exonuclease activity and Pfu polymerase having a 3'-5' exonuclease activity were checked using a buffer for each of them by the same manner as in the control experiments. The titer of each of the used polymerases was made 2.5 units.

The substrate DNA was prepared in such a manner that, first, 0.2 mM of dATP, dGTP, dCTP and [³ H]TTP were added to 10 μg of lambda-DNA digested with HindIII, the 3'-end was elongated by Klenow polymerase, then DNA fragments were recovered by extracting with phenol and precipitated with ethanol and free mononucleotides were removed by a Spin column (manufactured by Clontech).

In the case of KOD polymerase and Pfu polymerase, 50-70% of free [³ H]TTP were detected after an incubation period of three hours, in the case of Taq polymerase and Tth polymerase, only 10-20% of free [³ H]TTP was noted.

It is preferred that said thermostable DNA polymerase contains an amino acid sequence given in SEQ ID No.1.

It is also preferred that said thermostable DNA polymerase is an enzyme having the following physical and chemical properties.

Action: It has a DNA synthetic activity and a 3'-5' exonuclease activity.

DNA extension rate: at least 30 bases/second

Optimum pH: 6.5-7.5 (at 75° C.)

Optimum temperature: 75° C.

Molecular weight: about 88-90 Kda

Amino acid sequence: as mentioned in SEQ ID No.1

An example of the methods for manufacturing DNA polymerase derived from a hyperthermophilic archaeon strain KOD1 is that thermostable DNA polymerase gene was cloned from strain KOD1 which was isolated from a solfatara at a wharf on Kodakara Island, Kagoshima so that a recombinant expression vector was constructed, then a transformant prepared by transformation by said recombinant vector was cultured and the thermostable DNA polymerase was collected from the culture followed by purifying.

In the present invention, the DNA polymerase derived from the above-mentioned hyperthermophilic archaeon strain KOD1 has a DNA synthesizing activity and a 3'-5' exonuclease activity and has a DNA extension rate of at least 30 bases/second. This property is used for conducting an amplification of nucleic acid.

The amplifying method of the present invention includes the following steps A to D.

A: modifying the target nucleic acid, if necessary, to produce single-stranded nucleic acids;

B: reacting the single-stranded nucleic acids with four kinds of dNTP and primers, wherein said primers are selected so as to be sufficiently complementary to different strands of target nucleic acid to anneal therewith, in a buffer solution which contains a thermostable DNA polymerase such that the above mentioned primers are annealed to the single-stranded nucleic acids and extension products are synthesized from the primers,

C: separating the primer extension products from the templates on which they are synthesized to produce single-stranded nucleic acids; and

D: repeatedly conducting the above mentioned steps B and C.

In the step A, the target nucleic acid is denatured if necessary to give a single-stranded nucleic acid. The means therefor may be a thermal treatment, a chemical denaturation or an enzymatic treatment. Preferably, it is a thermal treatment.

In the step B, said single-stranded nucleic acid is made to react with four kinds of DNTP (DATP, dGTP, dCTP and dTTP or dUTP) and primers with regular and inverted directions having complementary base sequences to the target nucleic acid in a buffer solution containing a the rstable DNA polymerase so that said primers are annealed to the single-stranded nucleic acid to conduct a primer extension reaction.

A primer with a regular direction and that with an inverted direction having complementary base sequences to the target nucleic acid are oligonucleotides having a base sequence which is complementary to one strand of target nucleic acid and is homologous to another. Accordingly, one primer may be complementary to another primer elongate.

Preferred buffer solutions containing a thermostable DNA polymerase are Tris buffers containing divalent cation such as magnesium ion.

An example of the conditions for conducting an elongation reaction by annealing the primer is a method in which a cycle of 98° C./1 second-1 minute and 68° C./1 second-10 minutes is repeated for 30 times.

The step of separating an elongated primer for making a single strand in the step C may be a thermal treatment, a chemical treatment or an enzymatic treatment. Preferably, it is a thermal treatment or an enzymatic treatment using RNase.

In the step D, the above-mentioned steps B and C are repeated. To be more specific, it is preferred that heating and cooling of 98° C./20 seconds and 68° C./30 seconds are repeated at least for 30 cycles.

An amplifying method of the present invention is applicable to a PCR for amplifying a DNA of 20 kb or more (hereinafter, referred to as a long-PCR) as well. In this long-PCR, advantages of both high DNA extension rate of Taq polymerase and high fidelity in DNA synthesis caused by a 3'-5' exonuclease activity of Pfu polymerase are necessary and both enzymes are used after mixing them. In this case, there is a question on a stability when both enzymes are stored in the same container because of the difference between their thermostabilities and that between the compositions of their stored solutions. However, in the DNA polymerase derived from a hyperthermophilic archaeon strain KOD1, a single enzyme exhibits both high DNA extension rate and high fidelity due to its 3'-5' exonuclease activity whereby it is possible that a long-PCR can be conducted by its sole use.

In the present invention, the amplified product produced by the above-mentioned amplification such as a labeled probe is used whereby a target nucleic acid can be detected.

Labeled probe is an oligonucleotide having a base sequence which is complementary to a target nucleic acid and is bonded with a labeled substance or a labeled binding substance.

Examples of the labeled substance are enzymes such as alkaline phosphatase, peroxidase and galactosidase, fluorescent substances and radioactive substances while examples of the labeled binding substances are biotin and digoxigenin. Labeled substance may be bonded via biotin, digoxigenin or avidin.

A method of introducing those labels into a probe is that, during the synthesis of oligonucleotide, dNTP to which those labeled substances or labeled binding substances are bonded is used as one of the components of DNTP whereby a synthesis is conducted.

Examples of detecting a nucleic acid bonded with a labeled probe are conventionally known methods such as a Southern hybridization and a Northern hybridization. In those methods, the fact that a hybrid is formed when single-stranded DNA and RNA are complementary each other is utilized whereby unknown nucleic acid fraction group is subjected to an agarose electrophoresis to separate it by size, then the nucleic acid fraction in the gel is subjected, for example, to an alkali treatment, the resulting single strand is transferred to a filter, immobilized and hybridized with a labeled probe.

As to a detection of the label in case an alkaline phosphatase is used as a labeled substance, when a chemoluminescent substrate such as a 1,2-dioxetane compound (PPD) is made to react therewith, only nucleic acid forming a hybrid is illuminated. This is sensitized to an X-ray film whereby the size of the target nucleic acid and its position on electrophoresis can be confirmed.

A reagent kit for nucleic acid amplification according to the present invention contains primers of regular and inverted directions having base sequences complementary to target nucleic acid, four kinds of dNTP, divalent cation, thermostable DNA polymerase having a DNA extension rate of at least 30 bases/second and having a 3'-5' exonuclease activity and a buffer solution.

An example of divalent cation is magnesium ion. Its concentration is preferably about 1-3 mM. Examples of the buffer solution are tris buffer (pH 6.5, 75° C.) and tricine buffer (pH 6.5, 75° C.).

A specific example of the composition is as follows.

20 mM Tris-HCl (pH 6.5, 75° C.)

10 mM KCl

6 mM (NH₄)₂ SO₄

1-3 mM MgCl₂

0.1% Triton X-100

10 μg/ml BSA

20-200 μM dNTPs

0.1 pM-1 μM primer

0.1-250 ng template DNA.

A reagent kit for nucleic acid amplification according to the present invention contains a nucleic acid amplifying reagent comprising primers of regular and inverted directions having base sequences complementary to target nucleic acid, four kinds of dNTP, divalent cation, thermostable DNA polymerase having a DNA extension rate of at least 30 bases/second and having a 3'-5' exonuclease activity and a buffer solution for amplification, a target nucleic acid probe and a buffer for detection. The buffer for detection varies depending upon the label. For example, it includes a color reagent or a luminous reagent.

KOD1 which is a kind of hyperthermophilic archaeon used in the present invention is a strain isolated from a solfatara at a wharf on Kodakara Island, Kagoshima.

Mycological properties of said strain are as follows.

Shape of cells: coccus, diplococcus; having flagella.

Temperature range for the growth: 65-100° C.

Optimum temperature for the growth: 95° C.

pH range for the growth: 5-9

Optimum pH: 6

Optimum salt concentration: 2-3%

Auxotrophy: heterotrophic

Oxygen demand: aerophobic

Cell membrane lipids: ether type

GC content of DNA: 38%

The hyperthermophilic archaeon strain KOD1 was a coccus having a diameter of about 1 μm and had plural polar flagella. From the mycological properties of the strain, its close relationship with Pfu DNA polymerase-productive bacterium (Pyrococcus furiosus) and with Tli (Vent) DNA polymerase-productive bacterium (Thermococcus litoralis) was suggested.

Cloning of the thermaostable DNA polymerase gene of the present invention is carried out as follows.

Thus, the cloning method is that a primer is designed and synthesized depending upon an amino acid sequence in a conserved region of Pfu DNA polymerase (Nucleic Acids Research, 1993, vol.21, No.2, 259-265).

First, a PCR is conducted using the above-prepared primers (e.g., SEQ ID Nos.7 and 8) taking chromosomal DNA of the hyperthermophilic archaeon strain KOD1 as a template to amplify the DNA fragment. The DNA sequence (e.g., SEQ ID No.9) of the amplified fragment is determined and, after confirming that the originally set amino acid sequence is coded for, a Southern hybridization is conducted to the cleaved product of the chromosomal DNA with a restriction enzyme using said fragment as a probe. It is preferred that the approximate size of the fragment containing the target DNA polymerase gene is limited to about 4-7 Kbp.

Then DNA fragment of about 4-7 Kbp is recovered from the gel, a DNA library is prepared by Escherichia coli using said fragment and a colony hybridization is carried out using the above-mentioned PCR-amplified DNA fragment (e.g., SEQ ID No.9) to collect a clone strain.

The DNA polymerase gene of the strain KOD1 cloned in the present invention is composed of 5010 bases (estimated numbers of amino acids: 1670) (SEQ ID No.5).

Upon comparison with other DNA polymerases, there is a conserved region of aDNA polymerase which is an eukaryote type (Regions 1-5) in the gene of the present invention. In addition, there are EXO 1,2,3 which are 3'→5' exonuclease motif at the N terminal of said gene. In the conserved regions (Regions 1, 2) of the thermostable DNA polymerase gene derived from the hyperthermophilic archaeon strain KOD1, each of the intervening sequences is present and they are connected in a form where the open reading frame (ORF) is conserved.

When the thermostable DNA polymerase gene of the hyperthermophilic archaeon strain KOD1 is compared with Pfu DNA polymerase gene derived from Pyrococcus furiosus (Japanese Laid-Open Patent Publication Hei-05/328969) and with Tli (Vent) DNA polymerase gene derived from Thermococcus litoralis (Japanese Laid-Open Patent Publication He-06/7160) which are known enzymes, intervening sequence is present in the gene of the strain KOD1 of the present invention while there is no intervening sequence in the gene of the above-mentioned Pfu DNA polymerase and, in the Tli DNA polymerase gene, there are two kinds of intervening sequences but they are present within Regions 2 and 3 which are conserved regions and that greatly differs from the location where the intervening sequence in the thermostable DNA polymerase gene of KOD1 strain of the present invention exists (Refer to FIG. 7).

The gene of the present invention is a DNA which codes for the DNA polymerase derived from the hyperthermophilic archaeon strain KOD1. An example of said DNA contains a base sequence which codes for the amino acid sequence mentioned in SEQ ID No. 1 or 5. Further, such a DNA contains a base sequence mentioned in SEQ ID No. 5 or 6 or a part thereof.

In order to express the thermostable DNA polymerase derived from the hyperthermophilic archaeon strain KOD1 of the present invention in Escherichia coli, the intervening sequences of 1374-2453 bp and 2708-4316 bp in the base sequence shown by SEQ ID No.5 are removed by means of a PCR gene fusion to construct a DNA polymerase gene of a complete form. To be specific, a PCR is conducted on a cloned gene containing the intervening sequence by a combination of three pairs of primers to amplify the three fragments which are divided by the intervening sequence. In designing the primers used here, a part of the fragment which is to be bonded to its terminal is contained in its 5'-end. Then a PCR is conducted using the fragments to be bonded utilizing the duplicated sequence of the terminal whereby each of the fragments is bonded. Further PCR is conducted by the same manner using the resulting two kinds of fragments to give a DNA polymerase gene in a complete form containing no DNA polymerase gene derived from the strain KOD1 containing no intervening sequence.

Any vector may be used in the present invention so far as it makes cloning and expression of the thermostable DNA polymerase derived from KOD1 possible and its example is phage and plasmid. An example of the plasmid is a plasmid vector wherein an expression induced by T7 promoter is possible such as pET-8c. Other examples of the plasmid are pUC19, pBR322, pBluescript, pSP73, pGW7, pET3A and pET11C and so on. Examples of the phage are lambda gt11, lambda DASH and lambda ZapII and so on.

Examples of the host cell used in the present invention are Escherichia coli and yeasts. Examples of Escherichia coli are JM109, 101, XL1, PR1 and BL21(DE3)pysS and so on.

In the present invention, the gene coding for the thermostable DNA polymerase derived from the above-mentioned KOD1 is inserted into the above-mentioned vector to give a recombinant vector and the host cell is subjected to a transformation using said recombinant vector.

In the production method of the present invention, the above-mentioned recombinant host cell is cultured whereby the thermostable DNA polymerase gene derived from the strain KOD1 is induced and expressed. The culture medium used for the culture of the recombinant host cell and the condition therefor follow the conventional methods.

In a specific example, Escherichia coli which is transformed by pET-8c plasmid containing a DNA polymerase gene in a complete form containing no intervening sequence derived from the strain KOD1 is cultured, for example, in a TB medium whereby an induction treatment is conducted. It is preferred that the induction treatment of T7 promoter is carried out by addition of isopropyl-thio-β-D-galactoside.

The purifying method of the present invention includes, after culturing the recombinant host cells, a step wherein (a) recombinant host cells are collected, lysed and the cell extract is prepared and a step wherein (b) impure protein derived from the host cells is removed.

The thermostable DNA polymerase which is produced from the recombinant host cells is separated and recovered from the culture liquid by means of centrifugation or the like after culturing the host bacterial cells in a medium followed by inducing. After said bacterial cells are resuspended in a buffer, they are lysed by means of ultrasonic treatment, Dyno mill, French press, etc. Then a thermal treatment is conducted and the heat stable DNA polymerase is recovered from the supernatant fluid. In disintegrating the bacterial cells, ultrasonic treatment, Dyno mill and French press method are preferred.

A thermal treatment is preferred as one of the steps for removing the impure protein derived from the host cells. The condition for the thermal treatment is at 70° C. or higher or, preferably, at 90° or higher. Other means for removing the impure protein are various chromatographic techniques.

Molecular weight of the the stable DNA polymerase derived from the hyperthermophilic archaeon strain KOD1 obtained as such is about 90 KDa (cf. FIG. 5).

When a polymerase chain reaction is conducted using said thermostable DNA polymerase, a sufficient amplification of the aimed DNA fragments is confirmed (cf. FIG. 6).

EXAMPLE 1 Cloning of DNA Polymerase Gene Derived from hyperthermophilic archaeon strain KOD1

The hyperthermophilic archaeon strain KOD1 isolated in Kodakara Island, Kagoshima was cultured at 95° C. and then the bacterial cells were recovered. Chromosomal DNA of the hyperthermophilic archaeon strain KOD1 was prepared by a conventional method from the resulting bacterial cells.

Two kinds of primers (5'-GGATTAGTATAGTGCCAATGGAAGGCGAC-3' [SEQ ID No.7] and 5'-GAGGGCGAAGTTTATTCCGAGCTT-3' [SEQ ID No.8]) were synthesized based upon the amino acid sequence at the conserved region of the DNA polymerase (Pfu polymerase) derived from Pyrococcus furiosus. A PCR was carried out using those two primers where the prepared chromosomal DNA was used as a template.

After the base sequence (SEQ ID No.9) of the PCR-amplified DNA fragment was determined and the amino acid sequence (SEQ ID No.10) was determined, a Southern hybridization was conducted using said amplified DNA fragment to the product of the strain KOD1 chromosomal DNA treated with a restriction enzyme whereby the size of the fragment coding for the DNA polymerase was calculated (about 4-7 Kbp). Further, the DNA fragment of this size was recovered from agarose gel, inserted into a plasmid pBS (manufactured by Stratgene) and Escherichia coli (E. coli JM 109) was transformed by this mixture to prepare a library.

A colony hybridization was conducted using a probe (SEQ ID No.9) used for the Southern hybridization to obtain a clone strain (E. coli JM109/pBSKOD1) which is thought to contain the DNA polymerase gene derived from strain KOD1.

EXAMPLE 2 Determination of Base Sequence of the Clone Fragment

A plasmid pBSKOD1 was recovered from the clone strain E. coli JM109/pBSKOD1 obtained in Example 1 and its base sequence (SEQ ID No.5) was determined by a conventional method. Further, the amino acid sequence was presumed from the determined base sequence. The DNA polymerase gene derived from KOD1 strain comprised 5010 bases wherein 1670 amino acids were coded.

EXAMPLE 3 Construction of Recombinant Expression Vector

In order to prepare a complete polymerase gene, the intervening sequence parts at two places (1374-2453 bp and 2708-4316 bp) were removed by a PCR fusion method. In the PCR fusion method, three pairs of primers (SEQ ID Nos.11-16) were combined using a primer recovered from the clone strain as a template and a PCR was conducted for each of them to amplify three fragments wherefrom the intervening sequences were removed. At that time, the primer used for the PCR was designed in such a manner that the side which binds to another fragment has the same sequence as the binding partner has. In addition, a design was conducted in such a manner that different restriction enzyme sites (EcoRV at N-terminal where BamHI at C-terminal) were created at both ends.

After that, among the PCR-amplified fragments, that which is located at the central part of the structure and that which is located at the N-terminal side are mixed and a PCR was conducted using each of the fragments as a primer. At the same time, the fragment located at the central part of the structure and that located at the C-terminal side are mixed and a PCR was conducted using each of the fragments as a primer. Two kinds of fragments obtained as such were subjected to a PCR once again to give gene fragments in a complete form having no intervening sequence, having EcoRV and BamHI sites at the N- and C-terminals, respectively and coding for the DNA polymerase derived from strain KOD1.

Further, said gene was subcloned using an expression vector which can be induced by T7 promoter, an NcoI/BamHI site of pET-8c and the previously-created restriction enzyme site to give a recombinant expression vector (pET-pol).

EXAMPLE 4 Expression and Purification of DNA Polymerase Derived from KOD1

Escherichia coli (BL21(DE3)) was transformed using a recombinant expression vector (pET-pol) obtained in Example 3, the resulting transformant was cultured in a TB medium (mentioned in Molecular Cloning, p.A.2, 1989) and, at one hour before collecting the bacterial cells, an induction treatment of T7 promoter was conducted by addition of isopropylthio-β-D-galactopyrenoside. Bacterial cells were recovered from the cultured liquid by means of centrifugation. They were resuspended in a buffer and disintegrated by an ultrasonic treatment to give a cell extract. In order to remove the impure protein derived from the host cells, the disintegrated cell solution was treated at 94° C. for 20 minutes whereby the impure protein derived from the host cells trifugation to give a thermostable. DNA polymerase derived from strain KOD1.

The Eschericia coli BL21 (DE3) pER-pol was deposited on Apr. 22, 1996 under the Budepest Treaty at National Institute of Bioscience and Human-Technology Agency of Industrial Science and Technology (1-3, Higashi 1 chome Tsukuba-shi Ibaraki-ken 305, JAPAN) in accordance with the Budapest Treaty under the accession number FERM BP-5513.

EXAMPLE 5 Purification of Thermostable DNA Polymerase Derived from KOD1

Molecular weight of the thermostable DNA polymerase derived from KOD1 obtained in Example 4 was calculated by means of an SDS-PAGE method whereby it was found to be about 86-92 kDa (FIG. 5). Further, a PCR was conducted using the thermostable DNA polymerase derived from KOD1 obtained in Example 4 and the known template primer whereupon a DNA fragment which was to be a target was confirmed (FIG. 6) by the same manner as in the case where the thermostable DNA polymerase derived from Thermococcus litoralis was used and a high thermostable DNA polymerase activity was confirmed.

Comparative Example 1 Comparison with the Thermostable DNA Polymerase Gene Derived from Pyrococcus furiosus or from Thermococcus litoralis which are to be Similar to the Hyperthermophilic archaeon strain KOD1 of the Present Invention

Amino acid sequences were estimated from the DNA sequences of the DNA polymerase gene derived from the hyperthermophilic archaeon strain KOD1 of the present invention (SEQ ID No.6), the thermostable DNA polymerase gene derived from Pyrococcus furiosus (Japanese Laid-Open Patent Publication Hei-5/328969) and the thermostable DNA polymerase gene derived from Thermococcus litoralis (Japanese Laid-Open Patent Publication Hei-6/7160) and were compared and investigated.

In the DNA polymerase derived from KODI of the present invention, there were Regions 1-5 which were the conserved regions of αDNA polymerase of an eurokaryotic type. Further, there were EXO1, 2 and 3 which were 3'→5' exonuclease motifs at the N-terminal side. However, in each of the Region 1 and Region 2 which were the αDNA polymerase conserved regions, there were intervening sequences IVS-A and IVS-B (refer to FIG. 7).

On the other hand, in Pfu polymerase which is a thermostable DNA polymerase derived from Pyrococcus furiosus, there was no intervening sequence. In the case of Vent polymerase which is a thermostable DNA polymerase derived from Thermococcus litoralis, there were the intervening sequences (IVS1 and IVS2) in the αDNA polymerase conserved regions (Region 2 and Region 3) (refer to FIG.7).

EXAMPLE 6 Measurement of DNA Extension Rate of the DNA Polymerase Derived from Hyperthermophilic archaeon strain KOD1

DNA prepared by annealing the M13mp18DNA with M13P7 primer having a base sequence as mentioned in SEQ ID No.2 was used as a substrate and the rate of synthesizing the DNA in a reaction buffer solution [20 mM Tris-HCl (pH 7.5 at 75° C.), 10 mM KCl, 6 mM (NH₄)₂ SO₄, 2 mM MgCl₂, 0.1% Triton X-100 and 10 μg/ml nuclease-free BSA] containing the DNA polymerase derived from the hyperthermophilic archaeon strain KOD1 manufactured in Examples 1-5 was investigated for the reaction time of 20, 40, 60, 80 and 100 seconds (FIG. 1) or 40, 60, 80 and 100 seconds (FIG. 2). The results are given in FIG. 1 and in FIG. 2.

A part of the DNA sample during the elongation reaction was taken out for each reaction time and was added to a reaction stopping solution (60 mM EDTA, 60 μM NaOH, 0.1% BPB and 30% glycerol) in the same amount.

The DNA samples obtained in the above process were separated and analyzed by means of an alkaline agarose electrophoresis and the size of the synthesized DNA was checked.

1, 2, 3, 4 and 5 in FIG. 1 show the results of the reactions for 0.3 minute (20 seconds), 0.7 minute (40 seconds), 1 minute (60 seconds), 1.3 minutes (80 seconds) and 1.7 minutes (100 seconds), respectively. It is apparent from FIG. 1 that the DNA extension rate of the DNA polymerase derived from the hyperthermophilic archaeon strain KOD1 was 105 bases/second.

1, 2, 3 and 4 in FIG. 2 show the results of the reaction for 0.7 minute (40 seconds), 1 minute (60 seconds), 1.3 minutes (80 seconds) and 1.7 minutes (100 seconds), respectively. It is apparent from FIG. 2 that the DNA extension rate of the DNA polymerase derived from the hyperthermophilic archaeon strain KOD1 was 138 bases/second.

On the other hand, the DNA synthesizing rate of each of Pfu polymerase (Stratgene), Deep Vent polymerase (New England Biolabo) and Taq polymerase (Takara Shuzo) was measured by the same manner in each of the buffers therefor (FIG. 2a and FIG. 2b). The DNA extension rates of those DNA polymerases were 24.8 bases/second for Pfu polymerase, 23.2 bases/second for Deep Vent polymerase and 61.0 bases/second for Taq polymerase.

From the above results, it was suggested that the DNA extension rate of the DNA polymerase derived from the hyperthermophilic archaeon strain KOD1 was about six-fold of those of Pfu polymerase and Deep Vent polymerase and about two-fold of that of Taq polymerase.

EXAMPLE 7 Measurement of Fidelity of the DNA Polymerase Derived from the Hyperthermophilic Archaeon strain KOD1 in the Reaction for the Synthesis of DNA

A rate for resulting in an error in the DNA synthesis was measured by a method of Kunkel (Kunkel, 1985, Journal of Biological Chemistry, 260, 5787-5796). In this method, a DNA synthesis reaction was conducted using a DNA polymerase derived from the hyperthermophilic archaeon strain KOD1 manufactured in Examples 1-5 using an M13mpl8DNA having a gap at a lacZ part containing a part of the genes coding for β-galactosidase as a substrate and transfected to E. coli JM109 in an NZY medium containing 5-bromo-4-chloro-3-indolyl-β-D-galactoside and isopropyl-thio-β-D-galactoside using an M13mpl8DNA in which lacZ part was double-stranded.

When β-galactosidase wherein a function is lost or lowered was expressed due to a reading error or a frame shift during the synthetic reaction of DNA, it is not possible to utilize 5-bromo-4-chloro-3-indolyl-β-D-galactoside whereupon the color of plaque becomes colorless or light blue. On the other hand, when there is no error in the synthesized DNA and a complete β-galactosidase was expressed, plaque becomes blue. The rate of induction of error was measured in the DNA synthesis from the rate of the sum of colorless and light blue plaque to the total plaque.

The rate of induction of error in the DNA synthesis was also measured for Pfu polymerase (Stratgene), Tag polymerase (Takara Shuzo) and delta Tth polymerase (Toyobo) which were made to react by the same manner.

Further, the rate of induction of error in the DNA synthesis was also measured for a mixture of Taq polymerase and Pfu polymerase. The results are given in Table 1.

                  TABLE 1                                                          ______________________________________                                         Measurement of Fidelity in the Reaction of DNA Synthesis of                     DNA Polymerase Derived from Hyperthermophilic archaeon strain KOD1                                                   Mutant                                                                          Enzyme Light Blue White Mutant                                                Total Frequence(10.sup.-4)              ______________________________________                                         KOD1 pol.                                                                               12       11      23    6619 37.7                                        Pfu 15 15 30 7691 39.0                                                         Taq 30 24 54 4141 130                                                          ▴Tth 70 45 115 7375 156                                         Taq/Pfu(20:1) 10 20 30 4238 63.7                                               Taq/Pfu(50:1) 10 13 23 4489 53.5                                             ______________________________________                                    

It is apparent from Table 1 that the fidelity of the DNA polymerase derived from hyperthermophilic archaeon strain KOD1 in the DNA synthesis reaction is suggested to be superior to Taq polymerase and same as Pfu polymerase. In addition, a mixture of Taq polymerase and Pfu polymerase exhibits a medium fidelity that it is superior to Taq polymerase and inferior to Pfu polymerase.

EXAMPLE 8 Comparison in PCR of Various Thermostable DNA Polymerases by the Difference in the Reaction Time

Lambda-DNA (3 μg) was used as a target nucleic acid; oligo-nucleotides having a sequence as mentioned in SEQ ID Nos. 3 and 4 were used as primers; and a buffer containing 20 mM Tri-HCl (pH 7.5 at 75° C.), 10 mM KCl, 6 mM (NH₄)₂ SO₄, 2 mM MgCl₂, 0.1% Triton X-100, 10 μg/ml BSA and 200 μM dNTPs was used as a buffer. DNA polymerase derived from hyperthermophilic archaeon strain KOD1 (KOD polymerase), Taq polymerase which is widely used for PCR and Pfu polymerase which exhibits 3'-5' exonuclease activity were also used as the thermostable DNA polymerases. The used titer of each polymerase was 2 units.

A PCR amplification reaction was conducted using a DNA Thermal Cycler (Perkin-Elmer) in a schedule wherein a cycle comprising 94° C./20 seconds and 68° C./x second (x: reaction time) was repeated for 30 times. In the case of the DNA polymerase derived from the hyperthermophilic archaeon strain KOD1 (KOD polymerase), amplification of the target DNA was confirmed by conducting 30 cycles of 94° C./20 seconds-68° C./1 second while, in the case of Taq polymerase, amplification of DNA was first confirmed by conducting 30 cycles of 94° C./20 seconds-68° C./10 seconds. In the case of Pfu polymerase, amplification of DNA was at least confirmed by conducting 30 cycles of 94° C./20 seconds-68° C./1 minute. The results are given in FIG. 3.

In the present invention, it is possible to amplify the DNA with a high fidelity within a short reaction time when a DNA polymerase derived from hyperthermophilic archaeon strain KOD1 which is a thermostable DNA polymerase having at least 30 bases/second of DNA extension rate and having a 3'-5' exonuclease activity. When this method is made into a form of a kit, it is possible to improve the simplicity and convenience. In addition, when only one kind of thermostable DNA polymerase having both high extension rate (at least 30 bases/second) which has not been available yet and 3'-5' exonuclease activity is used, it is possible to shorten the time for the primer extension reaction and to amplify the relatively big product with a high fidelity.

    __________________________________________________________________________     #             SEQUENCE LISTING                                                    - -  - - (1) GENERAL INFORMATION:                                              - -    (iii) NUMBER OF SEQUENCES: 16                                           - -  - - (2) INFORMATION FOR SEQ ID NO: 1:                                     - -      (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 774 amino - #acids                                                 (B) TYPE: amino acid                                                           (C) STRANDEDNESS: double                                                       (D) TOPOLOGY: linear                                                  - -     (ii) MOLECULE TYPE: protein                                            - -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO: - #1:                            - - Met Ile Leu Asp Thr Asp Tyr Ile Thr Glu As - #p Gly Lys Pro Val         Ile                                                                                               5 - #                  - #10                  - #15           - - Arg Ile Phe Lys Lys Glu Asn Gly Glu Phe Ly - #s Ile Glu Tyr Asp Arg                    20     - #             25     - #             30                   - - Thr Phe Glu Pro Tyr Phe Tyr Ala Leu Leu Ly - #s Asp Asp Ser Ala Ile                35         - #         40         - #         45                       - - Glu Glu Val Lys Lys Ile Thr Ala Glu Arg Hi - #s Gly Thr Val Val Thr            50             - #     55             - #     60                           - - Val Lys Arg Val Glu Lys Val Gln Lys Lys Ph - #e Leu Gly Arg Pro Val        65                 - # 70                 - # 75                 - # 80        - - Glu Val Trp Lys Leu Tyr Phe Thr His Pro Gl - #n Asp Val Pro Ala Ile                        85 - #                 90 - #                 95               - - Arg Asp Lys Ile Arg Glu His Gly Ala Val Il - #e Asp Ile Tyr Glu Tyr                   100      - #           105      - #           110                   - - Asp Ile Pro Phe Ala Lys Arg Tyr Leu Ile As - #p Lys Gly Leu Val Pro               115          - #       120          - #       125                       - - Met Glu Gly Asp Glu Glu Leu Lys Met Leu Al - #a Phe Asp Ile Gln Thr           130              - #   135              - #   140                           - - Leu Tyr His Glu Gly Glu Glu Phe Ala Glu Gl - #y Pro Ile Leu Met Ile       145                 1 - #50                 1 - #55                 1 -       #60                                                                               - - Ser Tyr Ala Asp Glu Glu Gly Ala Arg Val Il - #e Thr Trp Lys Asn         Val                                                                                              165  - #               170  - #               175              - - Asp Leu Pro Tyr Val Asp Val Val Ser Thr Gl - #u Arg Glu Met Ile Lys                   180      - #           185      - #           190                   - - Arg Phe Leu Arg Val Val Lys Glu Lys Asp Pr - #o Asp Val Leu Ile Thr               195          - #       200          - #       205                       - - Tyr Asn Gly Asp Asn Phe Asp Phe Ala Tyr Le - #u Lys Lys Arg Cys Glu           210              - #   215              - #   220                           - - Lys Leu Gly Ile Asn Phe Ala Leu Gly Arg As - #p Gly Ser Glu Pro Lys       225                 2 - #30                 2 - #35                 2 -       #40                                                                               - - Ile Gln Arg Met Gly Asp Arg Phe Ala Val Gl - #u Val Lys Gly Arg         Ile                                                                                              245  - #               250  - #               255              - - His Phe Asp Leu Tyr Pro Val Ile Arg Arg Th - #r Ile Asn Leu Pro Thr                   260      - #           265      - #           270                   - - Tyr Thr Leu Glu Ala Val Tyr Glu Ala Val Ph - #e Gly Gln Pro Lys Glu               275          - #       280          - #       285                       - - Lys Val Tyr Ala Glu Glu Ile Thr Pro Ala Tr - #p Glu Thr Gly Glu Asn           290              - #   295              - #   300                           - - Leu Glu Arg Val Ala Arg Tyr Ser Met Glu As - #p Ala Lys Val Thr Tyr       305                 3 - #10                 3 - #15                 3 -       #20                                                                               - - Glu Leu Gly Lys Glu Phe Leu Pro Met Glu Al - #a Gln Leu Ser Arg         Leu                                                                                              325  - #               330  - #               335              - - Ile Gly Gln Ser Leu Trp Asp Val Ser Arg Se - #r Ser Thr Gly Asn Leu                   340      - #           345      - #           350                   - - Val Glu Trp Phe Leu Leu Arg Lys Ala Tyr Gl - #u Arg Asn Glu Leu Ala               355          - #       360          - #       365                       - - Pro Asn Lys Pro Asp Glu Lys Glu Leu Ala Ar - #g Arg Arg Gln Ser Tyr           370              - #   375              - #   380                           - - Glu Gly Gly Tyr Val Lys Glu Pro Glu Arg Gl - #y Leu Trp Glu Asn Ile       385                 3 - #90                 3 - #95                 4 -       #00                                                                               - - Val Tyr Leu Asp Phe Arg Ser Leu Tyr Pro Se - #r Ile Ile Ile Thr         His                                                                                              405  - #               410  - #               415              - - Asn Val Ser Pro Asp Thr Leu Asn Arg Glu Gl - #y Cys Lys Glu Tyr Asp                   420      - #           425      - #           430                   - - Val Ala Pro Gln Val Gly His Arg Phe Cys Ly - #s Asp Phe Pro Gly Phe               435          - #       440          - #       445                       - - Ile Pro Ser Leu Leu Gly Asp Leu Leu Glu Gl - #u Arg Gln Lys Ile Lys           450              - #   455              - #   460                           - - Lys Lys Met Lys Ala Thr Ile Asp Pro Ile Gl - #u Arg Lys Leu Leu Asp       465                 4 - #70                 4 - #75                 4 -       #80                                                                               - - Tyr Arg Gln Arg Ala Ile Lys Ile Leu Ala As - #n Ser Tyr Tyr Gly         Tyr                                                                                              485  - #               490  - #               495              - - Tyr Gly Tyr Ala Arg Ala Arg Trp Tyr Cys Ly - #s Glu Cys Ala Glu Ser                   500      - #           505      - #           510                   - - Val Thr Ala Trp Gly Arg Glu Tyr Ile Thr Me - #t Thr Ile Lys Glu Ile               515          - #       520          - #       525                       - - Glu Glu Lys Tyr Gly Phe Lys Val Ile Tyr Se - #r Asp Thr Asp Gly Phe           530              - #   535              - #   540                           - - Phe Ala Thr Ile Pro Gly Ala Asp Ala Glu Th - #r Val Lys Lys Lys Ala       545                 5 - #50                 5 - #55                 5 -       #60                                                                               - - Met Glu Phe Leu Asn Tyr Ile Asn Ala Lys Le - #u Pro Gly Ala Leu         Glu                                                                                              565  - #               570  - #               575              - - Leu Glu Tyr Glu Gly Phe Tyr Lys Arg Gly Ph - #e Phe Val Thr Lys Lys                   580      - #           585      - #           590                   - - Lys Tyr Ala Val Ile Asp Glu Glu Gly Lys Il - #e Thr Thr Arg Gly Leu               595          - #       600          - #       605                       - - Glu Ile Val Arg Arg Asp Trp Ser Glu Ile Al - #a Lys Glu Thr Gln Ala           610              - #   615              - #   620                           - - Arg Val Leu Glu Ala Leu Leu Lys Asp Gly As - #p Val Glu Lys Ala Val       625                 6 - #30                 6 - #35                 6 -       #40                                                                               - - Arg Ile Val Lys Glu Val Thr Glu Lys Leu Se - #r Lys Tyr Glu Val         Pro                                                                                              645  - #               650  - #               655              - - Pro Glu Lys Leu Val Ile His Glu Gln Ile Th - #r Arg Asp Leu Lys Asp                   660      - #           665      - #           670                   - - Tyr Lys Ala Thr Gly Pro His Val Ala Val Al - #a Lys Arg Leu Ala Ala               675          - #       680          - #       685                       - - Arg Gly Val Lys Ile Arg Pro Gly Thr Val Il - #e Ser Tyr Ile Val Leu           690              - #   695              - #   700                           - - Lys Gly Ser Gly Arg Ile Gly Asp Arg Ala Il - #e Pro Phe Asp Glu Phe       705                 7 - #10                 7 - #15                 7 -       #20                                                                               - - Asp Pro Thr Lys His Lys Tyr Asp Ala Glu Ty - #r Tyr Ile Glu Asn         Gln                                                                                              725  - #               730  - #               735              - - Val Leu Pro Ala Val Glu Arg Ile Leu Arg Al - #a Phe Gly Tyr Arg Lys                   740      - #           745      - #           750                   - - Glu Asp Leu Arg Tyr Gln Lys Thr Arg Gln Va - #l Gly Leu Ser Ala Trp               755          - #       760          - #       765                       - - Leu Lys Pro Lys Gly Thr                                                       770                                                                         - -  - - (2) INFORMATION FOR SEQ ID NO: 2:                                     - -      (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 24 base - #pairs                                                   (B) TYPE: nucleic acid                                                         (C) STRANDEDNESS: double                                                       (D) TOPOLOGY: linear                                                  - -     (ii) MOLECULE TYPE: other nucleic acid                                 - -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO: - #2:                            - - CGCCAGGGTT TTCCCAGTCA CGAC          - #                  - #                     24                                                                       - -  - - (2) INFORMATION FOR SEQ ID NO: 3:                                     - -      (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 20 base - #pairs                                                   (B) TYPE: nucleic acid                                                         (C) STRANDEDNESS: double                                                       (D) TOPOLOGY: linear                                                  - -     (ii) MOLECULE TYPE: other nucleic acid                                 - -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO: - #3:                            - - GGGCGGCGAC CTCGCGGGTT            - #                  - #                       - # 20                                                                    - -  - - (2) INFORMATION FOR SEQ ID NO: 4:                                     - -      (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 24 base - #pairs                                                   (B) TYPE: nucleic acid                                                         (C) STRANDEDNESS: double                                                       (D) TOPOLOGY: linear                                                  - -     (ii) MOLECULE TYPE: other nucleic acid                                 - -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:4:                                - - GCCCATAATA ATCTGCCGGT CAAT          - #                  - #                     24                                                                       - -  - - (2) INFORMATION FOR SEQ ID NO: 5:                                     - -      (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 5342 base - #pairs                                                 (B) TYPE: nucleic acid                                                         (C) STRANDEDNESS:  doub - #le                                                  (D) TOPOLOGY:  linear                                                 - -     (ii) MOLECULE TYPE: cDNA                                               - -     (vi) ORIGINAL SOURCE: Hyperthermophilic arch - #aeon                   - -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO: - #5:                            - - GCTTGAGGGC CTGCGGTTAT GGGACGTTGC AGTTTGCGCC TACTCAAAGA TG -              #CCGGTTTT     60                                                                  - - ATAACGGAGA AAAATGGGGA GCTATTACGA TCTCTCCTTG ATGTGGGGTT TA -             #CAATAAAG    120                                                                  - - CCTGGATTGT TCTACAAGAT TATGGGGGAT GAAAG ATG ATC CTC - #GAC ACT GAC            173                                                                                          - #                  - #   Met Ile Leu Asp Thr Asp                             - #                  - #                  - #  5              - - TAC ATA ACC GAG GAT GGA AAG CCT GTC ATA AG - #A ATT TTC AAG AAG GAA           221                                                                        Tyr Ile Thr Glu Asp Gly Lys Pro Val Ile Ar - #g Ile Phe Lys Lys Glu                         10     - #             15     - #             20                   - - AAC GGC GAG TTT AAG ATT GAG TAC GAC CGG AC - #T TTT GAA CCC TAC TTC           269                                                                        Asn Gly Glu Phe Lys Ile Glu Tyr Asp Arg Th - #r Phe Glu Pro Tyr Phe                     25         - #         30         - #         35                       - - TAC GCC CTC CTG AAG GAC GAT TCT GCC ATT GA - #G GAS GTC AAG AAG ATA           317                                                                        Tyr Ala Leu Leu Lys Asp Asp Ser Ala Ile Gl - #u Glu Val Lys Lys Ile                 40             - #     45             - #     50                           - - ACC GCC GAG AGG CAC GGG ACG GTT GTA ACG GT - #T AAG CGG GTT GAA AAG           365                                                                        Thr Ala Glu Arg His Gly Thr Val Val Thr Va - #l Lys Arg Val Glu Lys             55                 - # 60                 - # 65                 - # 70        - - GTT CAG AAG AAG TTC CTC GGG AGA CCA GTT GA - #G GTC TGG AAA CTC TAC           413                                                                        Val Gln Lys Lys Phe Leu Gly Arg Pro Val Gl - #u Val Trp Lys Leu Tyr                             75 - #                 80 - #                 85               - - TTT ACT CAT CCG CAG GAC GTC CCA GCG ATA AG - #G GAC AAG ATA CGA GAG           461                                                                        Phe Thr His Pro Gln Asp Val Pro Ala Ile Ar - #g Asp Lys Ile Arg Glu                         90     - #             95     - #            100                   - - CAT GGA GCA GTT ATT GAC ATC TAC GAG TAC GA - #C ATA CCC TTC GCC AAG           509                                                                        His Gly Ala Val Ile Asp Ile Tyr Glu Tyr As - #p Ile Pro Phe Ala Lys                    105          - #       110          - #       115                       - - CGC TAC CTC ATA GAC AAG GGA TTA GTG CCA AT - #G GAA GGC GAC GAG GAG           557                                                                        Arg Tyr Leu Ile Asp Lys Gly Leu Val Pro Me - #t Glu Gly Asp Glu Glu                120              - #   125              - #   130                           - - CTG AAA ATG CTC GCC TTC GAC ATT CAA ACT CT - #C TAC CAT GAG GGC GAG           605                                                                        Leu Lys Met Leu Ala Phe Asp Ile Gln Thr Le - #u Tyr His Glu Gly Glu            135                 1 - #40                 1 - #45                 1 -       #50                                                                               - - GAG TTC GCC GAG GGG CCA ATC CTT ATG ATA AG - #C TAC GCC GAC GAG         GAA      653                                                                     Glu Phe Ala Glu Gly Pro Ile Leu Met Ile Se - #r Tyr Ala Asp Glu Glu                           155  - #               160  - #               165               - - GGG GCC AGG GTG ATA ACT TGG AAG AAC GTG GA - #T CTC CCC TAC GTT GAC           701                                                                        Gly Ala Arg Val Ile Thr Trp Lys Asn Val As - #p Leu Pro Tyr Val Asp                        170      - #           175      - #           180                   - - GTC GTC TCG ACG GAG AGG GAG ATG ATA AAG CG - #C TTC CTC CGT GTT GTG           749                                                                        Val Val Ser Thr Glu Arg Glu Met Ile Lys Ar - #g Phe Leu Arg Val Val                    185          - #       190          - #       195                       - - AAG GAG AAA GAC CCG GAC GTT CTC ATA ACC TA - #C AAC GGC GAC AAC TTC           797                                                                        Lys Glu Lys Asp Pro Asp Val Leu Ile Thr Ty - #r Asn Gly Asp Asn Phe                200              - #   205              - #   210                           - - GAC TTC GCC TAT CTG AAA AAG CGC TGT GAA AA - #G CTC GGA ATA AAC TTC           845                                                                        Asp Phe Ala Tyr Leu Lys Lys Arg Cys Glu Ly - #s Leu Gly Ile Asn Phe            215                 2 - #20                 2 - #25                 2 -       #30                                                                               - - GCC CTC GGA AGG GAT GGA AGC GAG CCG AAG AT - #T CAG AGG ATG GGC         GAC      893                                                                     Ala Leu Gly Arg Asp Gly Ser Glu Pro Lys Il - #e Gln Arg Met Gly Asp                           235  - #               240  - #               245               - - AGG TTT GCC GTC GAA GTG AAG GGA CGG ATA CA - #C TTC GAT CTC TAT CCT           941                                                                        Arg Phe Ala Val Glu Val Lys Gly Arg Ile Hi - #s Phe Asp Leu Tyr Pro                        250      - #           255      - #           260                   - - GTG ATA AGA CGG ACG ATA AAC CTG CCC ACA TA - #C ACG CTT GAG GCC GTT           989                                                                        Val Ile Arg Arg Thr Ile Asn Leu Pro Thr Ty - #r Thr Leu Glu Ala Val                    265          - #       270          - #       275                       - - TAT GAA GCC GTC TTC GGT CAG CCG AAG GAG AA - #G GTT TAC GCT GAG GAA          1037                                                                        Tyr Glu Ala Val Phe Gly Gln Pro Lys Glu Ly - #s Val Tyr Ala Glu Glu                280              - #   285              - #   290                           - - ATA ACA CCA GCC TGG GAA ACC GGC GAG AAC CT - #T GAG AGA GTC GCC CGC          1085                                                                        Ile Thr Pro Ala Trp Glu Thr Gly Glu Asn Le - #u Glu Arg Val Ala Arg            295                 3 - #00                 3 - #05                 3 -       #10                                                                               - - TAC TCG ATG GAA GAT GCG AAG GTC ACA TAC GA - #G CTT GGG AAG GAG         TTC     1133                                                                     Tyr Ser Met Glu Asp Ala Lys Val Thr Tyr Gl - #u Leu Gly Lys Glu Phe                           315  - #               320  - #               325               - - CTT CCG ATG GAG GCC CAG CTT TCT CGC TTA AT - #C GGC CAG TCC CTC TGG          1181                                                                        Leu Pro Met Glu Ala Gln Leu Ser Arg Leu Il - #e Gly Gln Ser Leu Trp                        330      - #           335      - #           340                   - - GAC GTC TCC CGC TCC AGC ACT GGC AAC CTC GT - #T GAG TGG TTC CTC CTC          1229                                                                        Asp Val Ser Arg Ser Ser Thr Gly Asn Leu Va - #l Glu Trp Phe Leu Leu                    345          - #       350          - #       355                       - - AGG AAG GCC TAT GAG AGG AAT GAG CTG GCC CC - #G AAC AAG CCC GAT GAA          1277                                                                        Arg Lys Ala Tyr Glu Arg Asn Glu Leu Ala Pr - #o Asn Lys Pro Asp Glu                360              - #   365              - #   370                           - - AAG GAG CTG GCC AGA AGA CGG CAG AGC TAT GA - #A GGA GGC TAT GTA AAA          1325                                                                        Lys Glu Leu Ala Arg Arg Arg Gln Ser Tyr Gl - #u Gly Gly Tyr Val Lys            375                 3 - #80                 3 - #85                 3 -       #90                                                                               - - GAG CCC GAG AGA GGG TTG TGG GAG ACC ATA GT - #G TAC CTA GAT TTT         AGA     1373                                                                     Glu Pro Glu Arg Gly Leu Trp Glu Asn Ile Va - #l Tyr Leu Asp Phe Arg                           395  - #               400  - #               405               - - TGC CAT CCA GCC GAT ACG AAG GTT GTC GTC AA - #G GGG AAG GGG ATT ATA          1421                                                                        Cys His Pro Ala Asp Thr Lys Val Val Val Ly - #s Gly Lys Gly Ile Ile                        410      - #           415      - #           420                   - - AAC ATC AGC GAG GTT CAG GAA GGT GAC TAT GT - #C CTT GGG ATT GAC GGC          1469                                                                        Asn Ile Ser Glu Val Gln Glu Gly Asp Tyr Va - #l Leu Gly Ile Asp Gly                    425          - #       430          - #       435                       - - TGG CAG AGA GTT AGA AAA GTA TGG GAA TAC GA - #C TAC AAA GGG GAG CTT          1517                                                                        Trp Gln Arg Val Arg Lys Val Trp Glu Tyr As - #p Tyr Lys Gly Glu Leu                440              - #   445              - #   450                           - - GTA AAC ATA AAC GGG TTA AAG TGT ACG CCC AA - #T CAT AAG CTT CCC GTT          1565                                                                        Val Asn Ile Asn Gly Leu Lys Cys Thr Pro As - #n His Lys Leu Pro Val            455                 4 - #60                 4 - #65                 4 -       #70                                                                               - - GTT ACA AAG AAC GAA CGA CAA ACG AGA ATA AG - #A GAC AGT CTT GCT         AAG     1613                                                                     Val Thr Lys Asn Glu Arg Gln Thr Arg Ile Ar - #g Asp Ser Leu Ala Lys                           475  - #               480  - #               485               - - TCT TTC CTT ACT AAA AAA GTT AAG GGC AAG AT - #A ATA ACC ACT CCC CTT          1661                                                                        Ser Phe Leu Thr Lys Lys Val Lys Gly Lys Il - #e Ile Thr Thr Pro Leu                        490      - #           495      - #           500                   - - TTC TAT GAA ATA GGC AGA GCG ACA AGT GAG AA - #T ATT CCA GAA GAA GAG          1709                                                                        Phe Tyr Glu Ile Gly Arg Ala Thr Ser Glu As - #n Ile Pro Glu Glu Glu                    505          - #       510          - #       515                       - - GTT CTC AAG GGA GAG CTC GCT GGC ATA CTA TT - #G GCT GAA GGA ACG CTC          1757                                                                        Val Leu Lys Gly Glu Leu Ala Gly Ile Leu Le - #u Ala Glu Gly Thr Leu                520              - #   525              - #   530                           - - TTG AGG AAA GAC GTT GAA TAC TTT GAT TCA TC - #C CGC AAA AAA CGG AGG          1805                                                                        Leu Arg Lys Asp Val Glu Tyr Phe Asp Ser Se - #r Arg Lys Lys Arg Arg            535                 5 - #40                 5 - #45                 5 -       #50                                                                               - - ATT TCA CAC CAG TAT CGT GTT GAG ATA ACC AT - #T GGG AAA GAC GAG         GAG     1853                                                                     Ile Ser His Gln Tyr Arg Val Glu Ile Thr Il - #e Gly Lys Asp Glu Glu                           555  - #               560  - #               565               - - GAG TTT AGG GAT CGT ATC ACA TAC ATT TTT GA - #G CGT TTG TTT GGG ATT          1901                                                                        Glu Phe Arg Asp Arg Ile Thr Tyr Ile Phe Gl - #u Arg Leu Phe Gly Ile                        570      - #           575      - #           580                   - - ACT CCA AGC ATC TCG GAG AAG AAA GGA ACT AA - #C GCA GTA ACA CTC AAA          1949                                                                        Thr Pro Ser Ile Ser Glu Lys Lys Gly Thr As - #n Ala Val Thr Leu Lys                    585          - #       590          - #       595                       - - GTT GCG AAG AAG AAT GTT TAT CTT AAA GTC AA - #G GAA ATT ATG GAC AAC          1997                                                                        Val Ala Lys Lys Asn Val Tyr Leu Lys Val Ly - #s Glu Ile Met Asp Asn                600              - #   605              - #   610                           - - ATA GAG TCC CTA CAT GCC CCC TCG GTT CTC AG - #G GGA TTC TTC GAA GGC          2045                                                                        Ile Glu Ser Leu His Ala Pro Ser Val Leu Ar - #g Gly Phe Phe Glu Gly            615                 6 - #20                 6 - #25                 6 -       #30                                                                               - - GAC GGT TCA GTA AAC AGG GTT AGG AGG AGT AT - #T GTT GCA ACC CAG         GGT     2093                                                                     Asp Gly Ser Val Asn Arg Val Arg Arg Ser Il - #e Val Ala Thr Gln Gly                           635  - #               640  - #               645               - - ACA AAG AAC GAG TGG AAG ATT AAA CTG GTG TC - #A AAA CTG CTC TCC CAG          2141                                                                        Thr Lys Asn Glu Trp Lys Ile Lys Leu Val Se - #r Lys Leu Leu Ser Gln                        650      - #           655      - #           660                   - - CTT GGT ATC CCT CAT CAA ACG TAC ACG TAT CA - #G TAT CAG GAA AAT GGG          2189                                                                        Leu Gly Ile Pro His Gln Thr Tyr Thr Tyr Gl - #n Tyr Gln Glu Asn Gly                    665          - #       670          - #       675                       - - AAA GAT CGG AGC AGG TAT ATA CTG GAG ATA AC - #T GGA AAG GAC GGA TTG          2237                                                                        Lys Asp Arg Ser Arg Tyr Ile Leu Glu Ile Th - #r Gly Lys Asp Gly Leu                680              - #   685              - #   690                           - - ATA CTG TTC CAA ACA CTC ATT GGA TTC ATC AG - #T GAA AGA AAG AAC GCT          2285                                                                        Ile Leu Phe Gln Thr Leu Ile Gly Phe Ile Se - #r Glu Arg Lys Asn Ala            695                 7 - #00                 7 - #05                 7 -       #10                                                                               - - CTG CTT AAT AAG GCA ATA TCT CAG AGG GAA AT - #G AAC AAC TTG GAA         AAC     2333                                                                     Leu Leu Asn Lys Ala Ile Ser Gln Arg Glu Me - #t Asn Asn Leu Glu Asn                           715  - #               720  - #               725               - - AAT GGA TTT TAC AGG CTC AGT GAA TTC AAT GT - #C AGC ACG GAA TAC TAT          2381                                                                        Asn Gly Phe Tyr Arg Leu Ser Glu Phe Asn Va - #l Ser Thr Glu Tyr Tyr                        730      - #           735      - #           740                   - - GAG GGC AAG GTC TAT GAC TTA ACT CTT GAA GG - #A ACT CCC TAC TAC TTT          2429                                                                        Glu Gly Lys Val Tyr Asp Leu Thr Leu Glu Gl - #y Thr Pro Tyr Tyr Phe                    745          - #       750          - #       755                       - - GCC AAT GGC ATA TTG ACC CAT AAC TCC CTG TA - #C CCC TCA ATC ATC ATC          2477                                                                        Ala Asn Gly Ile Leu Thr His Asn Ser Leu Ty - #r Pro Ser Ile Ile Ile                760              - #   765              - #   770                           - - ACC CAC AAC GTC TCG CCG GAT ACG CTC AAC AG - #A GAA GGA TGC AAG GAA          2525                                                                        Thr His Asn Val Ser Pro Asp Thr Leu Asn Ar - #g Glu Gly Cys Lys Glu            775                 7 - #80                 7 - #85                 7 -       #90                                                                               - - TAT GAC GTT GCC CCA CAG GTC GGC CAC CGC TT - #C TGC AAG GAC TTC         CCA     2573                                                                     Tyr Asp Val Ala Pro Gln Val Gly His Arg Ph - #e Cys Lys Asp Phe Pro                           795  - #               800  - #               805               - - GGA TTT ATC CCG AGC CTG CTT GGA GAC CTC CT - #A GAG GAG AGG CAG AAG          2621                                                                        Gly Phe Ile Pro Ser Leu Leu Gly Asp Leu Le - #u Glu Glu Arg Gln Lys                        810      - #           815      - #           820                   - - ATA AAG AAG AAG ATG AAG GCC ACG ATT GAC CC - #G ATC GAG AGG AAG CTC          2669                                                                        Ile Lys Lys Lys Met Lys Ala Thr Ile Asp Pr - #o Ile Glu Arg Lys Leu                    825          - #       830          - #       835                       - - CTC GAT TAC AGG CAG AGG GCC ATC AAG ATC CT - #G GCA AAC AGC ATC CTA          2717                                                                        Leu Asp Tyr Arg Gln Arg Ala Ile Lys Ile Le - #u Ala Asn Ser Ile Leu                840              - #   845              - #   850                           - - CCC GAG GAA TGG CTT CCA GTC CTC GAG GAA GG - #G GAG GTT CAC TTC GTC          2765                                                                        Pro Glu Glu Trp Leu Pro Val Leu Glu Glu Gl - #y Glu Val His Phe Val            855                 8 - #60                 8 - #65                 8 -       #70                                                                               - - AGG ATT GGA GAG CTC ATA GAC CGG ATG ATG GA - #G GAA AAT GCT GGG         AAA     2813                                                                     Arg Ile Gly Glu Leu Ile Asp Arg Met Met Gl - #u Glu Asn Ala Gly Lys                           875  - #               880  - #               885               - - GTA AAG AGA GAG GGC GAG ACG GAA GTG CTT GA - #G GTC AGT GGG CTT GAA          2861                                                                        Val Lys Arg Glu Gly Glu Thr Glu Val Leu Gl - #u Val Ser Gly Leu Glu                        890      - #           895      - #           900                   - - GTC CCG TCC TTT AAC AGG AGA ACT AAC AAG GC - #C GAG CTC AAG AGA GTA          2909                                                                        Val Pro Ser Phe Asn Arg Arg Thr Asn Lys Al - #a Glu Leu Lys Arg Val                    905          - #       910          - #       915                       - - AAG GCC CTG ATT AGG CAC GAT TAT TCT GGC AA - #G GTC TAC ACC ATC AGA          2957                                                                        Lys Ala Leu Ile Arg His Asp Tyr Ser Gly Ly - #s Val Tyr Thr Ile Arg                920              - #   925              - #   930                           - - CTG AAG TCG GGG AGG AGA ATA AAG ATA ACC TC - #T GGC CAC AGC CTC TTC          3005                                                                        Leu Lys Ser Gly Arg Arg Ile Lys Ile Thr Se - #r Gly His Ser Leu Phe            935                 9 - #40                 9 - #45                 9 -       #50                                                                               - - TCT GTG AGA AAC GGG GAG CTC GTT GAA GTT AC - #G GGC GAT GAA CTA         AAT     3053                                                                     Ser Val Arg Asn Gly Glu Leu Val Glu Val Th - #r Gly Asp Glu Leu Lys                           955  - #               960  - #               965               - - CCA GGT GAC CTC GTT GCA GTC CCG CGG AGA TT - #G GAG CTT CCT GAG AGA          3101                                                                        Pro Gly Asp Leu Val Ala Val Pro Arg Arg Le - #u Glu Leu Pro Glu Arg                        970      - #           975      - #           980                   - - AAC CAC GTG CTG AAC CTC GTT GAA CTG CTC CT - #T GGA ACG CCA GAA GAA          3149                                                                        Asn His Val Leu Asn Leu Val Glu Leu Leu Le - #u Gly Thr Pro Glu Glu                    985          - #       990          - #       995                       - - GAA ACT TTG GAC ATC GTC ATG ACG ATC CCA GT - #C AAG GGT AAG AAG AAC          3197                                                                        Glu Thr Leu Asp Ile Val Met Thr Ile Pro Va - #l Lys Gly Lys Lys Asn                1000             - #   1005              - #  1010                          - - TTC TTT AAA GGG ATG CTC AGG ACT TTG CGC TG - #G ATT TTC GGA GAG GAA          3245                                                                        Phe Phe Lys Gly Met Leu Arg Thr Leu Arg Tr - #p Ile Phe Gly Glu Glu            1015                1020 - #                1025 - #               1030         - - AAG AGG CCC AGA ACC GCG AGA CGC TAT CTC AG - #G CAC CTT GAG GAT CTG          3293                                                                        Lys Arg Pro Arg Thr Ala Arg Arg Tyr Leu Ar - #g His Leu Glu Asp Leu                            1035 - #               1040  - #              1045              - - GGC TAT GTC CGG CTT AAG AAG ATC GGC TAC GA - #A GTC CTC GAC TGG GAC          3341                                                                        Gly Tyr Val Arg Leu Lys Lys Ile Gly Tyr Gl - #u Val Leu Asp Trp Asp                        1050     - #           1055      - #          1060                  - - TCA CTT AAG AAC TAC AGA AGG CTC TAC GAG GC - #G CTT GTC GAG AAC GTC          3389                                                                        Ser Leu Lys Asn Tyr Arg Arg Leu Tyr Glu Al - #a Leu Val Glu Asn Val                    1065         - #       1070          - #      1075                      - - AGA TAC AAC GGC AAC AAG AGG GAG TAC CTC GT - #T GAA TTC AAT TCC ATC          3437                                                                        Arg Tyr Asn Gly Asn Lys Arg Glu Tyr Leu Va - #l Glu Phe Asn Ser Ile                1080             - #   1085              - #  1090                          - - CGG GAT GCA GTT GGC ATA ATG CCC CTA AAA GA - #G CTG AAG GAG TGG AAG          3485                                                                        Arg Asp Ala Val Gly Ile Met Pro Leu Lys Gl - #u Leu Lys Glu Trp Lys            1095                1100 - #                1105 - #               1110         - - ATC GGC ACG CTG AAC GGC TTC AGA ATG AGA AA - #G CTC ATT GAA GTG GAC          3533                                                                        Ile Gly Thr Leu Asn Gly Phe Arg Met Arg Ly - #s Leu Ile Glu Val Asp                            1115 - #               1120  - #              1125              - - GAG TCG TTA GCA AAG CTC CTC GGC TAC TAC GT - #G AGC GAG GGC TAT GCA          3581                                                                        Glu Ser Leu Ala Lys Leu Leu Gly Tyr Tyr Va - #l Ser Glu Gly Tyr Ala                        1130     - #           1135      - #          1140                  - - AGA AAG CAG AGG AAT CCC AAA AAC GGC TGG AG - #C TAC AGC GTG AAG CTC          3629                                                                        Arg Lys Gln Arg Asn Pro Lys Asn Gly Trp Se - #r Tyr Ser Val Lys Leu                    1145         - #       1150          - #      1155                      - - TAC AAC GAA GAC CCT GAA GTG CTG GAC GAT AT - #G GAG AGA CTC GCC AGC          3677                                                                        Tyr Asn Glu Asp Pro Glu Val Leu Asp Asp Me - #t Glu Arg Leu Ala Ser                1160             - #   1165              - #  1170                          - - AGG TTT TTC GGG AAG GTG AGG CGG GGC AGG AA - #C TAC GTT GAG ATA CCG          3725                                                                        Arg Phe Phe Gly Lys Val Arg Arg Gly Arg As - #n Tyr Val Glu Ile Pro            1175                1180 - #                1185 - #               1190         - - AAG AAG ATC GGC TAC CTG CTC TTT GAG AAC AT - #G TGC GGT GTC CTA GCG          3773                                                                        Lys Lys Ile Gly Tyr Leu Leu Phe Glu Asn Me - #t Cys Gly Val Leu Ala                            1195 - #               1200  - #              1205              - - GAG AAC AAG AGG ATT CCC GAG TTC GTC TTC AC - #G TCC CCG AAA GGG GTT          3821                                                                        Glu Asn Lys Arg Ile Pro Glu Phe Val Phe Th - #r Ser Pro Lys Gly Val                        1210     - #           1215      - #          1220                  - - CGG CTG GCC TTC CTT GAG GGG TAC TCA TCG GC - #G ATG GCG ACG TCC ACC          3869                                                                        Arg Leu Ala Phe Leu Glu Gly Tyr Ser Ser Al - #a Met Ala Thr Ser Thr                    1225         - #       1230          - #      1235                      - - GAA CAA GAG ACT CAG GCT CTC AAC GAA AAG CG - #A GCT TTA GCG AAC CAG          3917                                                                        Glu Gln Glu Thr Gln Ala Leu Asn Glu Lys Ar - #g Ala Leu Ala Asn Gln                1240             - #   1245              - #  1250                          - - CTC GTC CTC CTC TTG AAC TCG GTG GGG GTC TC - #T GCT GTA AAA CTT GGG          3965                                                                        Leu Val Leu Leu Leu Asn Ser Val Gly Val Se - #r Ala Val Lys Leu Gly            1255                1260 - #                1265 - #               1270         - - CAC GAC AGC GGC GTT TAC AGG GTC TAT ATA AA - #C GAG GAG CTC CCG TTC          4013                                                                        His Asp Ser Gly Val Tyr Arg Val Tyr Ile As - #n Glu Glu Leu Pro Phe                            1275 - #               1280  - #              1285              - - GTA AAG CTG GAC AAG AAA AAG AAC GCC TAC TA - #C TCA CAC GTG ATC CCC          4061                                                                        Val Lys Leu Asp Lys Lys Lys Asn Ala Tyr Ty - #r Ser His Val Ile Pro                        1290     - #           1295      - #          1300                  - - AAG GAA GTC CTG AGC GAG GTC TTT GGG AAG GT - #T TTC CAG AAA AAC GTC          4109                                                                        Lys Glu Val Leu Ser Glu Val Phe Gly Lys Va - #l Phe Gln Lys Asn Val                    1305         - #       1310          - #      1315                      - - AGT CCT CAG ACC TTC AGG AAG ATG GTC GAG GA - #C GGA AGA CTC GAT CCC          4157                                                                        Ser Pro Gln Thr Phe Arg Lys Met Val Glu As - #p Gly Arg Leu Asp Pro                1320             - #   1325              - #  1330                          - - GAA AAG GCC CAG AGG CTC TCC TGG CTC ATT GA - #G GGG GAC GTA GTG CTC          4205                                                                        Glu Lys Ala Gln Arg Leu Ser Trp Leu Ile Gl - #u Gly Asp Val Val Leu            1335                1340 - #                1345 - #               1350         - - GAC CGC GTT GAG TCC GTT GAT GTG GAA GAC TA - #C GAT GGT TAT GTC TAT          4253                                                                        Asp Arg Val Glu Ser Val Asp Val Glu Asp Ty - #r Asp Gly Tyr Val Tyr                            1355 - #               1360  - #              1365              - - GAC CTG AGC GTC GAG GAC AAC GAG AAC TTC CT - #C GTT GGC TTT GGG TTG          4301                                                                        Asp Leu Ser Val Glu Asp Asn Glu Asn Phe Le - #u Val Gly Phe Gly Leu                        1370     - #           1375      - #          1380                  - - GTC TAT GCT CAC AAC AGC TAC TAC GGT TAC TA - #C GGC TAT GCA AGG GCG          4349                                                                        Val Tyr Ala His Asn Ser Tyr Tyr Gly Tyr Ty - #r Gly Tyr Ala Arg Ala                    1385         - #       1390          - #      1395                      - - CGC TGG TAC TGC AAG GAG TGT GCA GAG AGC GT - #A ACG GCC TGG GGA AGG          4397                                                                        Arg Trp Tyr Cys Lys Glu Cys Ala Glu Ser Va - #l Thr Ala Trp Gly Arg                1400             - #   1405              - #  1410                          - - GAG TAC ATA ACG ATG ACC ATC AAG GAG ATA GA - #G GAA AAG TAC GGC TTT          4445                                                                        Glu Tyr Ile Thr Met Thr Ile Lys Glu Ile Gl - #u Glu Lys Tyr Gly Phe            1415                1420 - #                1425 - #               1430         - - AAG GTA ATC TAC AGC GAC ACC GAC GGA TTT TT - #T GCC ACA ATA CCT GGA          4493                                                                        Lys Val Ile Tyr Ser Asp Thr Asp Gly Phe Ph - #e Ala Thr Ile Pro Gly                            1435 - #               1440  - #              1445              - - GCC GAT GCT GAA ACC GTC AAA AAG AAG GCT AT - #G GAG TTC CTC AAC TAT          4541                                                                        Ala Asp Ala Glu Thr Val Lys Lys Lys Ala Me - #t Glu Phe Leu Asn Tyr                        1450     - #           1455      - #          1460                  - - ATC AAC GCC AAA CTT CCG GGC GCG CTT GAG CT - #C GAG TAC GAG GGC TTC          4589                                                                        Ile Asn Ala Lys Leu Pro Gly Ala Leu Glu Le - #u Glu Tyr Glu Gly Phe                    1465         - #       1470          - #      1475                      - - TAC AAA CGC GGC TTC TTC GTC ACG AAG AAG AA - #G TAT GCG GTG ATA GAC          4637                                                                        Tyr Lys Arg Gly Phe Phe Val Thr Lys Lys Ly - #s Tyr Ala Val Ile Asp                1480             - #   1485              - #  1490                          - - GAG GAA GGC AAG ATA ACA ACG CGC GGA CTT GA - #G ATT GTG AGG CGT GAC          4685                                                                        Glu Glu Gly Lys Ile Thr Thr Arg Gly Leu Gl - #u Ile Val Arg Arg Asp            1495                1500 - #                1505 - #               1510         - - TGG AGC GAG ATA GCG AAA GAG ACG CAG GCG AG - #G GTT CTT GAA GCT TTG          4733                                                                        Trp Ser Glu Ile Ala Lys Glu Thr Gln Ala Ar - #g Val Leu Glu Ala Leu                            1515 - #               1520  - #              1525              - - CTA AAG GAC GGT GAC GTC GAG AAG GCC GTG AG - #G ATA GTC AAA GAA GTT          4781                                                                        Leu Lys Asp Gly Asp Val Glu Lys Ala Val Ar - #g Ile Val Lys Glu Val                        1530     - #           1535      - #          1540                  - - ACC GAA AAG CTG AGC AAG TAC GAG GTT CCG CC - #G GAG AAG CTG GTG ATC          4829                                                                        Thr Glu Lys Leu Ser Lys Tyr Glu Val Pro Pr - #o Glu Lys Leu Val Ile                    1545         - #       1550          - #      1555                      - - CAC GAG CAG ATA ACG AGG GAT TTA AAG GAC TA - #C AAG GCA ACC GGT CCC          4877                                                                        His Glu Gln Ile Thr Arg Asp Leu Lys Asp Ty - #r Lys Ala Thr Gly Pro                1560             - #   1565              - #  1570                          - - CAC GTT GCC GTT GCC AAG AGG TTG GCC GCG AG - #A GGA GTC AAA ATA CGC          4925                                                                        His Val Ala Val Ala Lys Arg Leu Ala Ala Ar - #g Gly Val Lys Ile Arg            1575                1580 - #                1585 - #               1590         - - CCT GGA ACG GTG ATA AGC TAC ATC GTG CTC AA - #G GGC TCT GGG AGG ATA          4973                                                                        Pro Gly Thr Val Ile Ser Tyr Ile Val Leu Ly - #s Gly Ser Gly Arg Ile                            1595 - #               1600  - #              1605              - - GGC GAC AGG GCG ATA CCG TTC GAC GAG TTC GA - #C CCG ACG AAG CAC AAG          5021                                                                        Gly Asp Arg Ala Ile Pro Phe Asp Glu Phe As - #p Pro Thr Lys His Lys                        1610     - #           1615      - #          1620                  - - TAC GAC GCC GAG TAC TAC ATT GAG AAC CAG GT - #T CTC CCA GCC GTT GAG          5069                                                                        Tyr Asp Ala Glu Tyr Tyr Ile Glu Asn Gln Va - #l Leu Pro Ala Val Glu                    1625         - #       1630          - #      1635                      - - AGA ATT CTG AGA GCC TTC GGT TAC CGC AAG GA - #A GAC CTG CGC TAC CAG          5117                                                                        Arg Ile Leu Arg Ala Phe Gly Tyr Arg Lys Gl - #u Asp Leu Arg Tyr Gln                1640             - #   1645              - #  1650                          - - AAG ACG AGA CAG GTT GGT TTG AGT GCT TGG CT - #G AAG CCG AAG GGA ACT          5165                                                                        Lys Thr Arg Gln Val Gly Leu Ser Ala Trp Le - #u Lys Pro Lys Gly Thr            1655                1660 - #                1665 - #               1670         - - TGACCTTTCC ATTTGTTTTC CAGCGGATAA CCCTTTAACT TCCCTTTCAA AA -              #ACTCCCTT   5225                                                                  - - TAGGGAAAGA CCATGAAGAT AGAAATCCGG CGGCGCCCGG TTAAATACGC TA -             #GGATAGAA   5285                                                                  - - GTGAAGCCAG ACGGCAGGGT AGTCGTCACT GCCCCGAGGG TTCAACGTTG AG - #AAGTT           5342                                                                        - -  - - (2) INFORMATION FOR SEQ ID NO: 6:                                     - -      (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 5339 base - #pairs                                                 (B) TYPE: nucleic acid                                                         (C) STRANDEDNESS:  doub - #le                                                  (D) TOPOLOGY: linear                                                  - -     (ii) MOLECULE TYPE: cDNA                                               - -     (vi) ORIGINAL SOURCE: Hyperthermophilic arch - #aeon                   - -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO: - #6:                            - - GCTTGAGGGC CTGCGGTTAT GGGACGTTGC AGTTTGCGCC TACTCAAAGA TG -              #CCGGTTTT     60                                                                  - - ATAACGGAGA AAAATGGGGA GCTATTACGA TCTCTCCTTG ATGTGGGGTT TA -             #CAATAAAG    120                                                                  - - CCTGGATTGT TCTACAAGAT TATGGGGGAT GAAAGATGAT CCTCGACACT GA -             #CTACATAA    180                                                                  - - CCGAGGATGG AAAGCCTGTC ATAAGAATTT TCAAGAAGGA AAACGGCGAG TT -             #TAAGATTG    240                                                                  - - AGTACGACCG GACTTTTGAA CCCTACTTCT ACGCCCTCCT GAAGGACGAT TC -             #TGCCATTG    300                                                                  - - AGGAAGTCAA GAAGATAACC GCCGAGAGGC ACGGGACGGT TGTAACGGTT AA -             #GCGGGTTG    360                                                                  - - AAAAGGTTCA GAAGAAGTTC CTCGGGAGAC CAGTTGAGGT CTGGAAACTC TA -             #CTTTACTC    420                                                                  - - ATCCGCAGGA CGTCCCAGCG ATAAGGGACA AGATACGAGA GCATGGAGCA GT -             #TATTGACA    480                                                                  - - TCTACGAGTA CGACATACCC TTCGCCAAGC GCTACCTCAT AGACAAGGGA TT -             #AGTGCCAA    540                                                                  - - TGGAAGGCGA CGAGGAGCTG AAAATGCTCG CCTTCGACAT TCAAACTCTC TA -             #CCATGAGG    600                                                                  - - GCGAGGAGTT CGCCGAGGGG CCAATCCTTA TGATAAGCTA CGCCGACGAG GA -             #AGGGGCCA    660                                                                  - - GGGTGATAAC TTGGAAGAAC GTGGATCTCC CCTACGTTGA CGTCGTCTCG AC -             #GGAGAGGG    720                                                                  - - AGATGATAAA GCGCTTCCTC CGTGTTGTGA AGGAGAAAGA CCCGGACGTT CT -             #CATAACCT    780                                                                  - - ACAACGGCGA CAACTTCGAC TTCGCCTATC TGAAAAAGCG CTGTGAAAAG CT -             #CGGAATAA    840                                                                  - - ACTTCGCCCT CGGAAGGGAT GGAAGCGAGC CGAAGATTCA GAGGATGGGC GA -             #CAGGTTTG    900                                                                  - - CCGTCGAAGT GAAGGGACGG ATACACTTCG ATCTCTATCC TGTGATAAGA CG -             #GACGATAA    960                                                                  - - ACCTGCCCAC ATACACGCTT GAGGCCGTTT ATGAAGCCGT CTTCGGTCAG CC -             #GAAGGAGA   1020                                                                  - - AGGTTTACGC TGAGGAAATA ACACCAGCCT GGGAAACCGG CGAGAACCTT GA -             #GAGAGTCG   1080                                                                  - - CCCGCTACTC GATGGAAGAT GCGAAGGTCA CATACGAGCT TGGGAAGGAG TT -             #CCTTCCGA   1140                                                                  - - TGGAGGCCCA GCTTTCTCGC TTAATCGGCC AGTCCCTCTG GGACGTCTCC CG -             #CTCCAGCA   1200                                                                  - - CTGGCAACCT CGTTGAGTGG TTCCTCCTCA GGAAGGCCCT ATGAGAGGAA TG -             #AGCTGGCC   1260                                                                  - - CCGAACAAGC CCGATGAAAA GGAGCTGGCC AGAAGACGGC AGAGCTATGA AG -             #GAGGCTAT   1320                                                                  - - GTAAAAGAGC CCGAGAGAGG GTTGTGGGAG AACATAGTGT ACCTAGATTT TA -             #GATGCCAT   1380                                                                  - - CCAGCCGATA CGAAGGTTGT CGTCAAGGGG AAGGGGATTA TAAACATCAG CG -             #AGGTTCAG   1440                                                                  - - GAAGGTGACT ATGTCCTTGG GATTGACGGC TGGCAGAGAG TTAGAAAAGT AT -             #GGGAATAC   1500                                                                  - - GACTACAAAG GGGAGCTTGT AAACATAAAC GGGTTAAAGT GTACGCCCAA TC -             #ATAAGCTT   1560                                                                  - - CCCGTTGTTA CAAAGAACGA ACGACAAACG AGAATAAGAG ACAGTCTTGC TA -             #AGTCTTTC   1620                                                                  - - CTTACTAAAA AAGTTAAGGG CAAGATAATA ACCACTCCCC TTTTCTATGA AA -             #TAGGCAGA   1680                                                                  - - GCGACAAGTG AGAATATTCC AGAAGAAGAG GTTCTCAAGG GAGAGCTCGC TG -             #GCATAGTA   1740                                                                  - - TTGGCTGAAG GAACGCTCTT GAGGAAAGAC GTTGAATACT TTGATTCATC CC -             #GCAAAAAA   1800                                                                  - - CGGAGGATTT CACACCAGTA TCGTGTTGAG ATAACCATTG GGAAAGACGA GG -             #AGGAGTTT   1860                                                                  - - AGGGATCGTA TCACATACAT TTTTGAGCGT TTGTTTGGGA TTACTCCAAG CA -             #TCTCGGAG   1920                                                                  - - AAGAAAGGAA CTAACGCAGT AACACTCAAA GTTGCGAAGA AGAATGTTTA TC -             #TTAAAGTC   1980                                                                  - - AAGGAAATTA TGGACAACAT AGAGTCCCTA CATGCCCCCT CGGTTCTCAG GG -             #GATTCTTC   2040                                                                  - - GAAGGCGACG GTTCAGTAAA CAGGTTAGGA GGAGTATTGT TGCAACCCAG GG -             #TACAAAGA   2100                                                                  - - ACGAGTGGAA GATTAAACTG GTGTCAAAAC TGCTCTCCCA GCTTGGTATC CC -             #TCATCAAA   2160                                                                  - - CGTACACGTA TCAGTATCAG GAAAATGGGA AAGATCGGAG CAGGTATATA CT -             #GGAGATAA   2220                                                                  - - CTGGAAAGGA CGGATTGATA CTGTTCCAAA CACTCATTGG ATTCATCAGT GA -             #AAGAAAGA   2280                                                                  - - ACGCTCTGCT TAATAAGGCA ATATCTCAGA GGGAAATGAA CAACTTGGAA AA -             #CAATGGAT   2340                                                                  - - TTTACAGGCT CAGTGAATTC AATGTCAGCA CGGAATACTA TGAGGGCAAG GT -             #CTATGACT   2400                                                                  - - TAACTCTTGA AGGAACTCCC TACTTTGCCA ATGGCATATT GACCCATAAC TC -             #CCTGTACC   2460                                                                  - - CCTCAATCAT CATCACCCAC AACGTCTCGC CGGATACGCT CAACAGAGAA GG -             #ATGCAAGG   2520                                                                  - - AATATGACGT TGCCCCACAG GTCGGCCACC GCTTCTGCAA GGACTTCCCA GG -             #ATTTATCC   2580                                                                  - - CGAGCCTGCT TGGAGACCTC CTAGAGGAGA GGCAGAAGAT AAAGAAGAAG AT -             #GAAGGCCA   2640                                                                  - - CGATTGACCC GATCGAGAGG AAGCTCCTCG ATTACAGGCA GAGGGCCATC AA -             #GATCCTGG   2700                                                                  - - CAAACAGCAT CCTACCCGAG GAATGGCTTC CAGTCCTCGA GGAAGGGGAG GT -             #TCACTTCG   2760                                                                  - - TCAGGATTGG AGAGCTCATA GACCGGATGA TGGAGGAAAA TGCTGGGAAA GT -             #AAAGAGAG   2820                                                                  - - AGGGCGAGAC GGAAGTGCTT GAGGTCAGTG GGCTTGAAGT CCCGTCCTTT AA -             #CAGGAGAA   2880                                                                  - - CTAACAAGGC CGAGCTCAAG AGAGTAAAGG CCCTGATTAG GCACGATTAT TC -             #TGGCAAGG   2940                                                                  - - TCTACACCAT CAGACTGAAG TCGGGGAGGA GAATAAAGAT AACCTCTGGC CA -             #CAGCCTCT   3000                                                                  - - TCTCTGTGAG AAACGGGGAG CTCGTTGAAG TTACGGGCGA TGAACTAAAG CC -             #AGGTGACC   3060                                                                  - - TCGTTGCAGT CCCGCGGAGA TTGGAGCTTC CTGAGAGAAA CCACGTGCTG AA -             #CCTCGTTG   3120                                                                  - - AACTGCTCCT TGGAACGCCA GAAGAAGAAA CTTTGGACAT CGTCATGACG AT -             #CCCAGTCA   3180                                                                  - - AGGGTAAGAA GAACTTCTTT AAAGGGATGC TCAGGACTTT GCGCTGGATT TT -             #CGGAGAGG   3240                                                                  - - AAAAGAGGCC CAGAACCGCG AGACGCTATC TCAGGCACCT TGAGGATCTG GG -             #CTATGTCC   3300                                                                  - - GGCTTAAGAA GATCGGCTAC GAAGTCCTCG ACTGGGACTC ACTTAAGAAC TA -             #CAGAAGGC   3360                                                                  - - TCTACGAGGC GCTTGTCGAG AACGTCAGAT ACAACGGCAA CAAGAGGGAG TA -             #CCTCGTTG   3420                                                                  - - AATTCAATTC CATCCGGGAT GCAGTTGGCA TAATGCCCCT AAAAGAGCTG AA -             #GGAGTGGA   3480                                                                  - - AGATCGGCAC GCTGAACGGC TTCAGAATGA GAAAGCTCAT TGAAGTGGAC GA -             #GTCGTTAG   3540                                                                  - - CAAAGCTCCT CGGCTACTAC GTGAGCGAGG GCTATGCAAG AAAGCAGAGG AA -             #TCCCAAAA   3600                                                                  - - ACGGCTGGAG CTACAGCGTG AAGCTCTACA ACGAAGACCC TGAAGTGCTG GA -             #CGATATGG   3660                                                                  - - AGAGACTCGC CAGCAGGTTT TTCGGGAAGG TGAGGCGGGG CAGGAACTAC GT -             #TGAGATAC   3720                                                                  - - CGAAGAAGAT CGGCTACCTG CTCTTTGAGA ACATGTGCGG TGTCCTAGCG GA -             #GAACAAGA   3780                                                                  - - GGATTCCCGA TGGCGTCTTC ACGTCCCCGA AAGGGGTTCG GCTGGCCTTC CT -             #TGAGGGGT   3840                                                                  - - ACTCATCGGC GATGGCGACG TCCACCGAAC AAGAGACTCA GGCTCTCAAC GA -             #AAAGCGAG   3900                                                                  - - CTTTAGCGAA CCAGCTCGTC CTCCTCTTGA ACTCGGTGGG GGTCTCTGCT GT -             #AAAACTTG   3960                                                                  - - GGCACGACAG CGGCGTTTAC AGGGTCTATA TAAACGAGGA GCTCCCGTTC GT -             #AAAGCTGG   4020                                                                  - - ACAAGAAAAA GAACGCCTAC TACTCACACG TGATCCCCAA GGAAGTCCTG AG -             #CGAGGTCT   4080                                                                  - - TTGGGAAGGT TTTCCAGAAA AACGTCAGTC CTCAGACCTT CAGGAAGATG GT -             #CGAGGACG   4140                                                                  - - GAAGACTCGA TCCCGAAAAG GCCCAGAGGC TCTCCTGGCT CATTGAGGGG GA -             #CGTAGTGC   4200                                                                  - - TCGACCGCGT TGAGTCCGTT GATGTGGAAG ACTACGATGG TTATGTCTAT GA -             #CCTGAGCG   4260                                                                  - - TCGAGGACAA CGAGAACTTC CTCGTTGGCT TTGGGTTGGT CTATGCTCAC AA -             #CAGCTACT   4320                                                                  - - ACGGTTACTA CGGCTATGCA AGGGCGCGCT GGTACTGCAA GGAGTGTGCA GA -             #GAGCGTAA   4380                                                                  - - CGGCCTGGGG AAGGGAGTAC ATAACGATGA CCATCAAGGA GATAGAGGAA AA -             #GTACGGCT   4440                                                                  - - TTAAGGTAAT CTACAGCGAC ACCGACGGAT TTTTTGCCAC AATACCTGGA GC -             #CGATGCTG   4500                                                                  - - AAACCGTCAA AAAGAAGGCT ATGGAGTTCC TCAACTATAT CAACGCCAAA CT -             #TCCGGGCG   4560                                                                  - - CGCTTGAGCT CGAGTACGAG GGCTTCTACA AACGCGGCTT CTTCGTCACG AA -             #GAAGAAGT   4620                                                                  - - ATGCGGTGAT AGACGAGGAA GGCAAGATAA CAACGCGCGG ACTTGAGATT GT -             #GAGGCGTG   4680                                                                  - - ACTGGAGCGA GATAGCGAAA GAGACGCAGG CGAGGGTTCT TGAAGCTTTG CT -             #AAAGGACG   4740                                                                  - - GTGACGTCGA GAAGGCCGTG AGGATAGTCA AAGAAGTTAC CGAAAAGCTG AG -             #CAAGTACG   4800                                                                  - - AGGTTCCGCC GGAGAAGCTG GTGATCCACG AGCAGATAAC GAGGGATTTA AA -             #GGACTACA   4860                                                                  - - AGGCAACCGG TCCCCACGTT GCCGTTGCCA AGAGGTTGGC CGCGAGAGGA GT -             #CAAAATAC   4920                                                                  - - GCCCTGGAAC GGTGATAAGC TACATCGTGC TCAAGGGCTC TGGGAGGATA GG -             #CGACAGGG   4980                                                                  - - CGATACCGTT CGACGAGTTC GACCCGACGA AGCACAAGTA CGATGCCGAG TA -             #CTACATTG   5040                                                                  - - AGAACCAGGT TCTCCCAGCC GTTGAGAGAA TTCTGAGAGC CTTCGGTTAC CG -             #CAAGGAAG   5100                                                                  - - ACCTGCGCTA CCAGAAGACG AGACAGGTTG GTTTGAGTGC TTGGCTGAAG CC -             #GAAGGGAA   5160                                                                  - - CTTGACCTTT CCATTTGTTT TCCAGCGGAT AACCCTTTAA CTTCCCTTTC AA -             #AAACTCCC   5220                                                                  - - TTTAGGGAAA GACCATGAAG ATAGAAATCC GGCGGCGCCC GGTTAAATAC GC -             #TAGGATAG   5280                                                                  - - AAGTGAAGCC AGACGGCAGG GTAGTCGTCA CTGCCCCGAG GGTTCAACGT TG -             #AGAAGTT    5339                                                                  - -  - - (2) INFORMATION FOR SEQ ID NO: 7:                                     - -      (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 24 base - #pairs                                                   (B) TYPE: nucleic acid                                                         (C) STRANDEDNESS:  doub - #le                                                  (D) TOPOLOGY: linear                                                  - -     (ii) MOLECULE TYPE: other nucleic acid                                 - -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO: - #7:                            - - GGATTAGTGC CAATGGAAGG CGAC          - #                  - #                     24                                                                      - -  - - (2) INFORMATION FOR SEQ ID NO: 8:                                     - -      (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 24 base - #pairs                                                   (B) TYPE: nucleic acid                                                         (C) STRANDEDNESS:  doub - #le                                                  (D) TOPOLOGY: linear                                                  - -     (ii) MOLECULE TYPE: other nucleic acid                                 - -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO: - #8:                            - - GAGGGCGAAG TTTATTCCGA GCTT          - #                  - #                     24                                                                       - -  - - (2) INFORMATION FOR SEQ ID NO: 9:                                     - -      (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 324 base - #pairs                                                  (B) TYPE: nucleic acid                                                         (C) STRANDEDNESS:  doub - #le                                                  (D) TOPOLOGY: linear                                                  - -     (ii) MOLECULE TYPE: cDNA                                               - -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO: - #9:                            - - GGATTAGTGC CAATGGAAGG CGACGAGGAG CTGAAAATGC TCGCCTTCGA CA -              #TTCAAACT     60                                                                  - - CTCTACCATG AGGGCGAGGA GTTCGCCGAG GGGCCAATCC TTATGATAAG CT -             #ACGCCGAC    120                                                                  - - GAGGAAGGGG CCAGGGTGAT AACTTGGAAG AACGTGGATC TCCCCTACGT TG -             #ACGTCGTC    180                                                                  - - TCGACGGAGA GGGAGATGAT AAAGCGCTTC CTCCGTGTTG TGAAGGAGAA AG -             #ACCCGGAC    240                                                                  - - GTTCTCATAA CCTACAACGG CGACAACTTC GACTTCGCCT ATCTGAAAAA GC -             #GCTGTGAA    300                                                                  - - AAGCTCGGAA TAAACTTCGC CCTC          - #                  - #                    324                                                                      - -  - - (2) INFORMATION FOR SEQ ID NO: 10:                                    - -      (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 108 amino - #acids                                                 (B) TYPE: amino acid                                                           (C) STRANDEDNESS: double                                                       (D) TOPOLOGY: linear                                                  - -     (ii) MOLECULE TYPE: protein                                            - -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO: - #10:                           - - Gly Leu Val Pro Met Glu Gly Asp Glu Glu Le - #u Lys Met Leu Ala Phe                        5 - #                  - #10                  - #15            - - Asp Ile Gln Thr Leu Tyr His Glu Gly Glu Gl - #u Phe Ala Glu Gly Pro                    20     - #             25     - #             30                   - - Ile Leu Met Ile Ser Tyr Ala Asp Glu Glu Gl - #y Ala Arg Val Ile Thr                35         - #         40         - #         45                       - - Trp Lys Asn Val Asp Leu Pro Tyr Val Asp Va - #l Val Ser Thr Glu Arg            50             - #     55             - #     60                           - - Glu Met Ile Lys Arg Phe Leu Arg Val Val Ly - #s Glu Lys Asp Pro Asp        65                 - # 70                 - # 75                 - # 80        - - Val Leu Ile Thr Tyr Asn Gly Asp Asn Phe As - #p Phe Ala Tyr Leu Lys                        85 - #                 90 - #                 95               - - Lys Arg Cys Glu Lys Leu Gly Ile Asn Phe Al - #a Leu                                   100      - #           105                                          - -  - - (2) INFORMATION FOR SEQ ID NO: 11:                                    - -      (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 42 base - #pairs                                                   (B) TYPE: nucleic acid                                                         (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                  - -     (ii) MOLECULE TYPE: other nucleic acid                                 - -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO: - #11:                           - - GCCATCAAGA TCCTGGCAAA CAGCTACTAC GGTTACTACG GC    - #                       - #  42                                                                       - -  - - (2) INFORMATION FOR SEQ ID NO: 12:                                    - -      (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 32 base - #pairs                                                   (B) TYPE: nucleic acid                                                         (C) STRANDEDNESS: single                                                       (D) TOPOLOGY:  linear                                                 - -     (ii) MOLECULE TYPE: other nucleic acid                                 - -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO: - #12:                           - - GATGGATCCA ACTTCTCAAC GTTGAACCCT CG       - #                  - #               32                                                                       - -  - - (2) INFORMATION FOR SEQ ID NO: 13:                                    - -      (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 46 base - #pairs                                                   (B) TYPE: nucleic acid                                                         (C) STRANDEDNESS:  sing - #le                                                  (D) TOPOLOGY: linear                                                  - -     (ii) MOLECULE TYPE: other nucleic acid                                 - -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO: - #13:                           - - GAACATAGTG TACCTAGATT TTAGATCCCT GTACCCCTCA ATCATC   - #                      46                                                                          - -  - - (2) INFORMATION FOR SEQ ID NO: 14:                                    - -      (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 42 base - #pairs                                                   (B) TYPE: nucleic acid                                                         (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                  - -     (ii) MOLECULE TYPE: other nucleic acid                                 - -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO: - #14:                           - - GCCGTAGTAA CCGTAGTAGC TGTTTGCCAG GATCTTGATG GC    - #                       - #  42                                                                       - -  - - (2) INFORMATION FOR SEQ ID NO: 15:                                    - -      (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 33 base - #pairs                                                   (B) TYPE: nucleic acid                                                         (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                  - -     (ii) MOLECULE TYPE: other nucleic acid                                 - -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO: - #15:                           - - ATCGATATCC TCGACACTGA CTACATAACC GAG       - #                  - #              33                                                                       - -  - - (2) INFORMATION FOR SEQ ID NO: 16:                                    - -      (i) SEQUENCE CHARACTERISTICS:                                                  (A) LENGTH: 46 base - #pairs                                                   (B) TYPE: nucleic acid                                                         (C) STRANDEDNESS: single                                                       (D) TOPOLOGY: linear                                                  - -     (ii) MOLECULE TYPE: other nucleic acid                                 - -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO: - #16:                           - - GATGATTGAG GGGTACAGGG ATCTAAAATC TAGGTACACT ATGTTC   - #                      46                                                                          - - 109758                                                                   __________________________________________________________________________ 

What we claim is:
 1. A method for amplifying a target nucleic acid comprising reacting the target nucleic acid with four kinds of dNTP and primer complementary to said target nucleic acid in a buffer solution which contains a thermostable DNA polymerase having the amino acid sequence of SEQ ID NO.1 such that the primer anneals to the target nucleic acid and extension product is synthesized from the primer.
 2. The method of claim 1, wherein said thermostable DNA polymerase is obtained from a hyperthermophilic archaeon strain.
 3. The method of claim 1, wherein said thermostable DNA polymerase is an enzyme having the following physical and chemical properties:Action: It catalyzing the extension reaction of nucleotide sequence that is complementary to a template nucleotide sequence using nucleotide triphosphates as template and having a 3'-5' exonuclease activity, DNA extension rate: at least 30 bases/second Optimum pH: 6.5-7.5 (at 75° C.) Optimum temperature: 75° C. Molecular weight: about 88-90 Kda Amino acid sequence: SEQ ID No.
 1. 4. A method for amplifying a target nucleic acid in a sample wherein said target nucleic acid consists of two separate complementary strands which comprises the following steps A to D, wherein a thermostable DNA polymerase having a DNA extension rate of at least 30 bases/second and a 3'-5' exonuclease activity is used as a thermostable DNA polymerase;A: optionally modifying the target nucleic acid, to produce single-stranded nucleic acids; B: reacting the single-stranded nucleic acids with four kinds of dNTP and primers, wherein said primers are selected so as to be sufficiently complementary to different strands of target nucleic acid to anneal therewith, in a buffer solution which contains a thermostable DNA polymerase such that the primers are annealed to the single-stranded nucleic acids templates and extension products are synthesized from the primers; C: separating the primer extension products from the templates on which they are synthesized to produce single-stranded nucleic acids; and D: repeatedly conducting the steps B and C.
 5. The method of claim 4, wherein said thermostable DNA polymerase is obtained from a hyperthermophilic archaeon strain.
 6. A method for detecting a target nucleic acid in a sample wherein said target nucleic acid consists of two complementary strands which comprises:A: optionally modifying double stranded target nucleic acid to produce single-stranded nucleic acids; B: reacting the single-stranded nucleic acids with four kinds of dNTP and primers, wherein said primers are selected so as to be sufficiently complementary to different strands of target nucleic acid to anneal therewith, in a buffer solution which contains a thermostable DNA polymerase such that the primers are annealed to the single-stranded nucleic acids templates and extension products are synthesized from the primers; C: separating the primer extension products from the templates on which they are synthesized to produce single-stranded nucleic acids; D: repeating steps B and C; and E: detecting amplified nucleic acid;wherein the DNA polymerase has the amino acid sequence of SEQ ID NO.
 1. 7. The method of claim 6, wherein said thermostable DNA polymerase is obtained from a hyperthermophilic archaeon strain.
 8. The method of claim 6, wherein said thermostable DNA polymerase is an enzyme having the following physical and chemical properties:Action: catalyzing the extension reaction of nucleotide sequence that is complementary to a template nucleotide sequence, using nucleotide triphosphates as substrate and having a 3'-5' exonuclease activity, DNA extension rate: at least 30 bases/second Optimum pH: 6.5-7.5 (at 75° C.) Optimum temperature: 75° C. Molecular weight: about 88-90 Kda Amino acid sequence: SEQ ID No.
 1. 9. A method for amplifying a target nucleic acid in a sample wherein said target nucleic acid consists of two complementary strands, comprising the following steps:1) optionally modifying the target nucleic acid to produce single-stranded nucleic acids; 2) reacting the single stranded nucleic acids with four kinds of dNTP and primers, wherein said primers are selected so as to be sufficiently complementary to different strands of target nucleic acids to anneal therewith, in a buffer solution which contains a thermostable DNA polymerase such that the primers are annealed to the single-stranded nucleic acid templates and extension products are synthesized from the primers; 3) separating the primer extension products from the templates on which they are synthesized to produce single-stranded nucleic acids; 4) repeating steps 2 and 3; and 5) detecting amplified nucleic acid;wherein the DNA polymerase has 3'-5' exonuclease activity and catalyzes extension of nucleotide sequences complementary to a template nucleotide sequence using nucleotide triphosphates as substrate; has an extension rate of at least 30 bases per second; has an optimum pH of 6.5-7.5 (at 75° C.); and has a molecular weight of about 88-90 Kda. 